A missing witness. A global crime ring. No good leads. Can Detective Callahan solve the case before it's too late?

Detective Callahan faces her most challenging case yet. She is pregnant with her first child and assigned to desk duty with firm orders to stay off the street.

Five years after the unsolved murder of two wealthy young men in western Canada, a potential witness vanishes to Berlin. Callahan teams up with German Detective Katriona Sager to investigate the enigmatic Hanna Winter, a suspect in an international human trafficking network.

As the two detectives work to establish a connection between the unsolved murders and Winter's illicit activities, they find themselves drawn into a web of deceit and danger that spans continents

With her keen instincts and unwavering determination, Callahan must confront the darkness that lurks beneath the surface while balancing her professional duties with the demands of her personal life.