Midnight on Hanging Bridge - Keira Willis

Manchester, 1987. A vanished girl. A missing policeman. A case buried for twenty years. Just as DI Andrew Joyce stumbles across the old investigation, his boss, DCI Higson, disappears, and he knows he needs Peggy Swan's help. As the Ballroom team digs deeper, the darker it gets, and this time they might not all make it back out.