England, 1912 is a place of rigid rules. A chance meeting between scullery maid Lizzy Parker and heiress Evie Creswell is about to break them all. Their meeting leads to an enduring friendship and a new job for Lizzy - it also draws her into a world of privilege and intrigue and delivers her into the loving arms of a killer. As she becomes embroiled in the dangerous life that Carlisle lives, she must decide if he can be trusted with the life of a close friend, and, ultimately, if he is worth the risk to her own...