Orphaned Sybil Delafield jumps at the opportunity for a position at the mysterious Croft Towers. She believes she was hired to act as companion to a dying woman, but a highway robbery and a hostile welcome from the Chalcroft family cause her to wonder if she was actually hired to help someone spy for France.

An unsolved murder adds intrigue to this already secretive family, and Sybil recognizes Mrs. Chalcroft's handsome grandson as one of the infamous highwaymen who robbed her. Sybil must determine if this man's charming smile and earnest eyes speak the truth or if he is simply using her like others in the house. Everyone seems to have something to hide, and Sybil must decide who to trust while also coming to terms with the truth about her own past.