Cora is a nymph, a barista by day, art thief by night, having inherited her beloved deceased father's appreciation of artifacts. Along with her trusted fence, she moves a special biological item, a kelpie heart, from the witch who removed it from its owner to a doctor seeking to purchase it for his research.

When she receives a cryptic message from her ex-best friend Damien to meet, she's initially more consumed with their tense past than him needing her experience as a thief to track something down.

But his request rocks her to her core: he's looking for the very heart she sold away. His heart. The one he needs back before he withers away. In a sudden race against time, the former friends must work together to track down Damien's heart, unearthing painful memories of Cora's father's incarceration and eventual death, and the roles that Damien and his own father played in the tragedy, forcing both to come to terms with the circumstances that pulled them apart.

To save his life, Cora will have to use all her ingenuity while confronting a past that led her to a life of crime—and caused her to lose the boy she loved along the way.