Season 4

Aboard a BOAC plane departing an unnamed Iron Curtain country, a stowaway has convinced a flight attendant to conceal him so he can defect on arrival in London. However, a high-ranking secret police officer posing as a passenger informs her that the man she's protecting is not wanted for his politics; actually, he is a murderer.

Young Victor Liebig returns from the theatre with his eccentric Aunt, when he receives a call summoning them to the flat of his Uncle's suicidal mistress.She's a young, bohemian type and Victor is smitten. She leads him on and he takes her out, but after meeting her friends, realises she's not for him.

Eddy, a young Midlands bargee, investigates the so-called accidental drowning death of a lifelong friend.