 A large quantity of fine wine has been stolen from a wholesaler s warehouse and the police think it is an inside job, because the burglar alarm was switched off. The prime suspect is the haulier Charlie Wallace. PC Rowan finds out that Alf Ventress has lost a lot of money at cards to Wallace and cannot settle his debts. Rowan decides to help his friend and colleague and trap Wallace at the same time. Lord Ashfordly has had intruders on his estate and when he catches Greengrass red-handed at poaching he hires the old scoundrel as a guard to keep off the intruders - unpaid of course.