The Cold Case Squad return in the darkest and most frightening series yet, reopening more unsolved cases and using their skills and modernised techniques to find the killers. With new offices in an eerie basement, a new team member who has secrets of her own and Boyd seemingly more reckless than ever, how will the Cold Case Squad react? Three months since the death of his son and a period of leave, Boyd is a man determined to get back to work with his team. Stella embarks on her last fateful mission for Boyd and we are introduced to DC Kat Howard, a new member of the Cold Case team. When Eve discovers that her new lover, Stefan, is implicated in a brutal murder, Boyd promises to support her. But when Boyd suspects Stefan of people-smuggling, Eve becomes determined to prove Stefan is innocent. How will Boyd and Eve resolve their conflict? And which of them is right? Plus for this series, acclaimed script writer Ed Whitmore pens a dark story about a brother and sister who are thrown from a 100ft bridge following a horrific attack. But twelve years on is Boyd able to give closure to the surviving sister?