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Calista Langley operates an exclusive 'introduction' agency in Victorian London, catering to respectable ladies and gentlemen who find themselves alone in the world. But now a dangerously obsessed individual has begun sending her trinkets and gifts suitable only for those in deepest mourning.

Desperate for help, Calista turns to Trent Hastings, a reclusive author of popular crime novels. It becomes clear that the danger may be coming from Calista's own secret past.