When a body is discovered in the water at the Falls of Lora, it looks like a straightforward suicide to DCI Christine Caplan. But when her superior officer alerts her to similarities with a locked case - and a legal minefield - she discovers that darker truths lurk beneath the surface.

'Girl A' was convicted of murdering three people when she was a child. Now she's missing and a man is dead. The top brass are screaming for a quick resolution, and 'Girl A' is a media sensation and a risk to herself as well as others. The clock is ticking for Caplan to bring her to justice - but the truth may be darker than even she fears . . .