Grace Morrigan is apprehended by the police and brought in for questioning. Determined to keep themselves and their loved ones from harm's way, Hicks and Renko come up with a scheme that will turn Morrigan's government colleagues against her, but the veteran spook refuses to let herself be outmanoeuvred so easily. Meanwhile, a woman's car is found abandoned near a meadow, with what appears to be a suicide note left on the dashboard. However, no body is found at the scene, prompting DS Mooney to suspect another serial killer is on the loose. But is his use of a illicit suicide forum simply a result of his deep-cover work? Or has the mild-mannered detective got a more personal stake in this case? Last in the series.