Her sister's killer

Newly promoted Inspector Frankie Oliver has been consumed by rooting out her sister's killer and bringing them to justice. But when new evidence comes to light, and her former boss DCI David Stone embarks on an investigation into the tragic unsolved murder without her knowledge, the ties that bind them begin to fray. After decades without answers, who knows where the trail might lead? And will knowing the answers be the very thing that breaks Frankie irreparably?