Nancy Drew tries to stop threats against her friend, a professional tennis player, while also searching for the girl's father and evidence which will prove he didn't commit a crime for which he's been convicted.
Nancy and her friends, in search of information about a UFO, become involved in another mystery involving the inheritance of an old man who lives in the forest.
Soon after Nancy, Bess, and George check into their cottage at Opa Tourist lodge, they discover the popular tourist retreat is a hotbed of deception and crime.
Nancy has volunteered to serve on a hospital ship that is docked in her home town for a fund raiser. But there are sinister secrets onboard, and Nancy must expose the shocking truth.