Look for Her by Emily Winslow

It is a psychological thriller and the fourth book in the "Keene and Frohmann Mystery Series". The plot centers on a cold case from 1976 involving the disappearance and murder of a teenage girl named Annalise Wood in an idyllic English village. Decades later, new DNA evidence linked to the case surfaces, leading detectives Morris Keene and Chloe Frohmann to reopen the investigation. The new evidence challenges the only certainty in the case: the body identified as Annalise may be someone else entirely