In the small village of Sueño Bay, famous for its mysterious crystals and legendary Moon Creatures, friends Sleeves, Jenna, Ollie and Kay attempt to solve one of the island's local mysteries—the disappearance of Jenny Mathers.

Sleeves is intrigued by a book about Sueño Bay mysteries—especially the story about Jenny Mathers, who vanished without a trace years ago. His curiosity grows when he finds a note from his dad tucked between the pages, which talks about Jenny’s disappearance and gives warnings about dark Moon Creatures and the need to find protective crystals. When Jenny's son, Jayden, overhears Sleeves talking about the mystery, he pressures Sleeves to go with him to Lost Harbor to find answers. Along with Jenna, Ollie, Kay and Conker, the gang heads up the island in their trusty go-cart on their biggest adventure yet.

This is the seventh book in the Sueño Bay Adventures series, following Shadow Island, Otter Lagoon, Hermit Hill, Candle Point, Crystal Cave and Howler Reef.

Praise for the Sueño Bay Adventure series:

★"Thrilling, joyous...Deas's expressive artwork includes the colorful landscapes and flora of Sueño Bay forests, from bright greens and yellows in the daytime to subdued blues and grays at night and in the rain. Atmospheric, wordless pages pack a huge punch in this book's emotional communication. The side effects of loneliness result in magic and danger in this satisfying, relatively self-contained third entry in the Sueño Bay Adventures series."—School Library Journal, starred review

In the small village of Sueño Bay, famous for its mysterious crystals and legendary Moon Creatures, friends Sleeves, Jenna, Ollie and Kay attempt to solve one of the island's local mysteries—the disappearance of Jenny Mathers.

Sleeves is intrigued by a book about Sueño Bay mysteries—especially the story about Jenny Mathers, who vanished without a trace years ago. His curiosity grows when he finds a note from his dad tucked between the pages, which talks about Jenny’s disappearance and gives warnings about dark Moon Creatures and the need to find protective crystals. When Jenny's son, Jayden, overhears Sleeves talking about the mystery, he pressures Sleeves to go with him to Lost Harbor to find answers. Along with Jenna, Ollie, Kay and Conker, the gang heads up the island in their trusty go-cart on their biggest adventure yet.

This is the seventh book in the Sueño Bay Adventures series, following Shadow Island, Otter Lagoon, Hermit Hill, Candle Point, Crystal Cave and Howler Reef.

Praise for the Sueño Bay Adventure series:

★"Thrilling, joyous...Deas's expressive artwork includes the colorful landscapes and flora of Sueño Bay forests, from bright greens and yellows in the daytime to subdued blues and grays at night and in the rain. Atmospheric, wordless pages pack a huge punch in this book's emotional communication. The side effects of loneliness result in magic and danger in this satisfying, relatively self-contained third entry in the Sueño Bay Adventures series."—School Library Journal, starred review