UCOS investigate the murder of a private investigator, stabbed through the heart in a suspected robbery gone wrong. The answers may well lie within the victim's last three cases but it'll take the whole team's expertise to crack the codes within his mysterious notebook. The movements of a rare collectable stamp, The Russian Cousin, could hold the key to the whole investigation - if only UCOS could track it down. Steve rents out his flat to a pair of demanding, hot-tempered Italians and Ted is determined to avoid a trip to the doctor for fear of coming face to face with his own mortality.