Calista Langley operates an exclusive introduction agency in Victorian London, catering to respectable ladies and gentlemen who find themselves alone in the world. Now a dangerously obsessive individual has begun sending her trinkets and gifts suitable only for those in deepest mourning: a black mirror, a funeral wreath, a ring set with black jet stone. Desperate for help and fearing that the police will be of no assistance, Calista turns to Trent Hastings, a reclusive author of popular crime novels, who doesn't trust her. As Trent and Calista comb through files of rejected clients in hopes of identifying her tormentor, it becomes clear that the danger may be coming from Calista's own secret past--and that only her death will satisfy the stalker. Bestseller. 2016.