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When her detective husband is murdered, PC Jo Gillespie is expected to leave it to her colleagues in the force to find his killer. But can Jo trust her police family?

As Jo digs further into Ryan's life as an undercover cop, she encounters dark secrets - leading to a disturbing revelation about the man she married.

When another body is discovered, Jo realises that her husband's killer is still out there - and closer to home than she ever imagined.