Series numeration from Fantastic Fiction.

"Crime-writing powerhouse Val McDermid is back with an explosive new thriller that sees psychological profiler Tony Hill and ex-detective Carol Jordan grappling with the consequences of their actions and the legacy of abuse in the Catholic Church. Construction is halted on the redevelopment of an orphanage after dozens of skeletons are found buried on the grounds dating from between twenty and forty years ago. Then a different set of skeletons are discovered in a far corner, young men from as recently as ten years ago. Meanwhile, Tony is behind bars for murder, and Carol has finally run out of road as a cop. While he's finding unexpected outlets for his talents in jail, she's looking into suspected miscarriages of justice. But they're doing it without each other; being together at visiting hour is too painful. When newly promoted DI Paula McIntyre discovers that one of the male skeletons belongs to a murder victim whose killer is supposedly behind bars--and the subject of one of Carol's investigations--it brings Tony and Carol irresistibly into each other's orbit once again."-- Provided by publisher.