Dark Water - Robert Bryndza

When Detective Erika Foster receives a tip off that key evidence for a major narcotics case was stashed in a disused quarry on the outskirts of London, she orders for it to be searched. The drugs are recovered but so is the skeleton of a young child. The remains are quickly identified as 11-year-old Jessica Collins. The missing girl who made headline news when she vanished 26 years ago.