Detective Sergeant Douglas Ashburner has little to worry him other than arranging his Stag Weekend until the new Solicitor General orders a review of an old miscarriage of justice involving a member of the Doherty clan convicted of a double murder. To complicate matters a new recruit to the MIU has been foisted on him. An old colleague has been assigned to assist him, but he doesn't know the reason why, and his new boss has just transferred from the military police and doesn't know one end of Glasgow from the other.