Eleven-year-old Chris and ten-year olds Skeet and Gail are enthusiastic collectors. With equal avidity they collect animals and rare stamps. When their eccentric neighbor, Mr. Doolittle, appears to be the victim of a stamp theft at the same time their white opossum is stolen, the kids turn to sleuthing.

"A lively mystery which imparts much incidental information on the hobby and science of stamp collecting. No gore, just good fun and excitement." -- Kirkus

9-year-old Tom Owens, a young New Yorker, must save his Uncle Steve''s reputation with the help of his friends. Steve has been accused of cutting the wire to the lights aboard the tugboat where he works, causing a collision with another boat, but despite the evidence, Tom knows his uncle is innocent. With the help of his friends, Bill and Janie, can Tom save the day?

"There are echoes of [The Firehouse Mystery] in the general pattern of the story, as once again a youngster determines to raise the fog that hangs over a beloved relative''s reputation." -- Kirkus Reviews

The Frontier Motel was the pride and joy of the Price family, especially David, aged twelve, who helped to run it. In three years they would own it, free and clear of debt, so David was willing to work hard taking care of the place and serving in their little restaurant. He had spare time, though, which he spent with his friends, Laurie and Johnny Smith, looking for uranium. His father had taught him a good deal about radioactivity and minerals and there was always a chance that he might find a deposit with his Geiger counter and help the family fortunes.

Miss Adrian’s latest mystery has this intriguing background and as usual her plot has satisfying speed coupled with interesting scientific facts which youngsters of today can easily absorb as they read swiftly along.

When Ken and his twin sister Chris visit their friend Marty in Utah, they can''t wait to go hunting for fossil remains of a dinosaur. With the help of a old map, can they locate the mysterious dinosaur graveyard? An exciting adventure-mystery!

"A mysterious old map, a strange night prowler, and a night spent in a cave help to make this an exciting mystery for the 8 to 12 year old." -- Hartford Courant

"In addition to a good story line, the book contains much basic information and scientific background." -- The Pittsburgh Press

City kid Randy is introduced to the wonders of nature by his country cousin, Jimmy, and eventually begins to love life in the country. The two boys build Hidden Lookout, a treehouse, and begin keeping watch on night animals. During the day, they follow clues to try to discover a long-hidden treasure.

"A quietly pleasant summer story set around the routine treasure hunt provides as well the unusual habits of common country ''critters.''" -- Kirkus

When two of four rare trumpeter swans disappear from their nesting place, four children living on the wildlife refuge set out to discover what happened to them.

"There is real suspense in this nature mystery set on a wildlife refuge." -- The Gastonia Gazette

THE SKIN DIVING MYSTERY is the story of four boys and a girl who belong to a skin-diving club. They have a wonderful time studying shells and marine animals together. But one day, a rare shell discovered by one of the members disappears. Then they all must concentrate on Operation Rare Shell to get it back. Jerry''s "Sea Animal Log" which is included at the back of the book.

"Mary Adrian''s new book, The Skin Diving Mystery, should prove as popular as her previous nature mysteries." --The News-Palladium, Benton Harbor, Mich.

"For skin diving fans 8 to 12, there''s a good mystery by Mary Adrian...The Skin Diving Mystery concerns itself with the loss of a rare shell after it was found by a member of the skin diving club." -- The Pittsburgh Press

Tim and his sister Vicki, along with their new friend Joey, hunt for a meteorite they saw fall from outer space -- but run into unexpected complications, including the disappearance of a telescope. And why is someone trespassing on their property and blinking colored lights at night? Something is up, and only the three kids can solve the mystery! Another classic Mary Adrian mystery.

Eleven-year-old Chris and ten-year olds Skeet and Gail are enthusiastic collectors. With equal avidity they collect animals and rare stamps. When their eccentric neighbor, Mr. Doolittle, appears to be the victim of a stamp theft at the same time their white opossum is stolen, the kids turn to sleuthing.

"A lively mystery which imparts much incidental information on the hobby and science of stamp collecting. No gore, just good fun and excitement." -- Kirkus

9-year-old Tom Owens, a young New Yorker, must save his Uncle Steve''s reputation with the help of his friends. Steve has been accused of cutting the wire to the lights aboard the tugboat where he works, causing a collision with another boat, but despite the evidence, Tom knows his uncle is innocent. With the help of his friends, Bill and Janie, can Tom save the day?

"There are echoes of [The Firehouse Mystery] in the general pattern of the story, as once again a youngster determines to raise the fog that hangs over a beloved relative''s reputation." -- Kirkus Reviews

The Frontier Motel was the pride and joy of the Price family, especially David, aged twelve, who helped to run it. In three years they would own it, free and clear of debt, so David was willing to work hard taking care of the place and serving in their little restaurant. He had spare time, though, which he spent with his friends, Laurie and Johnny Smith, looking for uranium. His father had taught him a good deal about radioactivity and minerals and there was always a chance that he might find a deposit with his Geiger counter and help the family fortunes.

Miss Adrian’s latest mystery has this intriguing background and as usual her plot has satisfying speed coupled with interesting scientific facts which youngsters of today can easily absorb as they read swiftly along.

When Ken and his twin sister Chris visit their friend Marty in Utah, they can''t wait to go hunting for fossil remains of a dinosaur. With the help of a old map, can they locate the mysterious dinosaur graveyard? An exciting adventure-mystery!

"A mysterious old map, a strange night prowler, and a night spent in a cave help to make this an exciting mystery for the 8 to 12 year old." -- Hartford Courant

"In addition to a good story line, the book contains much basic information and scientific background." -- The Pittsburgh Press

City kid Randy is introduced to the wonders of nature by his country cousin, Jimmy, and eventually begins to love life in the country. The two boys build Hidden Lookout, a treehouse, and begin keeping watch on night animals. During the day, they follow clues to try to discover a long-hidden treasure.

"A quietly pleasant summer story set around the routine treasure hunt provides as well the unusual habits of common country ''critters.''" -- Kirkus

When two of four rare trumpeter swans disappear from their nesting place, four children living on the wildlife refuge set out to discover what happened to them.

"There is real suspense in this nature mystery set on a wildlife refuge." -- The Gastonia Gazette

THE SKIN DIVING MYSTERY is the story of four boys and a girl who belong to a skin-diving club. They have a wonderful time studying shells and marine animals together. But one day, a rare shell discovered by one of the members disappears. Then they all must concentrate on Operation Rare Shell to get it back. Jerry''s "Sea Animal Log" which is included at the back of the book.

"Mary Adrian''s new book, The Skin Diving Mystery, should prove as popular as her previous nature mysteries." --The News-Palladium, Benton Harbor, Mich.

"For skin diving fans 8 to 12, there''s a good mystery by Mary Adrian...The Skin Diving Mystery concerns itself with the loss of a rare shell after it was found by a member of the skin diving club." -- The Pittsburgh Press

Tim and his sister Vicki, along with their new friend Joey, hunt for a meteorite they saw fall from outer space -- but run into unexpected complications, including the disappearance of a telescope. And why is someone trespassing on their property and blinking colored lights at night? Something is up, and only the three kids can solve the mystery! Another classic Mary Adrian mystery.