Cobweb

When a DCI is killed in a car crash, his superiors are convinced he was silenced because he was investigating the murder of MP Jason Giddings. Patrick Gillard and his consultant (and wife) Ingrid Langley are brought in to assess further risks to the police. They discover that DS Erin Melrose is determined to find the killers, and it is a mission that will put her and others in grave danger.