Description:The investigation into the murder of a former PSNI drugs squad officer leads Detective Superintendent Wilson and the Belfast Murder Squad to look close to home for the perpetrator. The investigation stalls until Wilson links to the current case to a four-year-old accidental death that may have been murder. Meanwhile, the off-the-books investigation into the death of Jackie Carlisle is advancing into an area that puts the life of DC Peter Davidson in danger. Moira McElvaney returns to Belfast to find her old job has been filled. Will Wilson manage to get her back into the squad?