In a small Scottish university town, what links a spate of murders, a targeted bomb explosion and a lecturer's disappearance? Who is pulling the strings? Having returned to Castletown intending to win back his estranged wife, DCI Jim Carruthers finds himself entrenched in the investigation. DS Andrea Fetcher assists him in the hunt for the perpetrators. They need to work fast. But can they truly rely on Jim's old adversary?