When Eloise Blackburn finds a strange gentleman perched in the leafy branches of an ash tree, she has strong suspicions he is not who he says he is. After all, the neighboring Allen family has never mentioned a cousin named Crispin from the West Indies. And what's this he's saying about a missing inheritance and a secret passageway in Allen Abbey? Despite Eloise's misgivings, her family finds Crispin Allen's story entirely plausible, and she is soon thrust into an adventure with a cheeky stranger who seems intent on winning more from her than just her help in his quest....