Lie by moonlight

A hired tutor for four orphaned girls at a remote Castle, Concordia Glade is pleased to find her pupils both eager & smart they are bright enough to notice some odd things about their situation. Provided for by an unseen benefactor, they are surrounded at all times by hard-eyed guards in the guise of gardeners—and their previous tutor, she learns, disappeared under mysterious circumstances. They get help from Concordia and Ambrose, a man who comes they're rescue.