A burglar is found dead at the home of Professor Busby, though nothing appears to have been stolen. Government official Bellcourt tells Regan and Carter that Busby was working on pills to relieve heart disease and that the burglary was no doubt masterminded by Danilov, the opponent of a head of state friendly to Britain - who would benefit from the pills. Busby goes on the run, entrusting his supply of pills to his girlfriend Wendy, who works with comedy duo Morecambe and Wise. They in fact end up with the pills - and are pursued by villains and Sweeney alike, ending in a very fishy climax.
—don @ minifie-1