The girl from Emerald Hill is the third book in the series titled Don't tell my secret. The girl from Emerald Hill is set in dual years; 2019 and 1942. Ryan Harris is an Air Force pilot. He volunteers to fly a plane faster than the speed of light. After landing in 1942, Ryan's plane needs repairing. The plane's computer orders him to seek out twelve-year-old Thomas Lene. After hearing the news, the Japanese will bomb Darwin in eighteen hours, Thomas makes a pact with Ryan to save his sister, Nicole. In return, Thomas agrees to repair the plane. Ryan is in a dilemma; to save Nicole from certain death, history will be changed. There are three different paths Ryan could choose.One: stay in 1942 and live a happy life somewhere.Two: save Nicole and go back to his time alone:Three: convince Nicole to leave Darwin and come with him to the year 2019.Ryan's decision is further complicated when he realizes he has fallen in love with Nicole.Which choice will he finally decide?Above everything, one question remains; who is the brains behind the time travel trip?