The Police investigate the theft of emerald jewelry which had led to murder.
A murderous jewelry heist attracts an ex-partner of the killer, a master criminal who's never been caught. His personal nemesis,a retired detective, joins Scotland Yard to crack the case, in turn recruiting the thief's estranged wife.
When a hired server is killed after a party for an artist and his fiancée, and soon after, the girl's hot tempered, disapproving old uncle is murdered too, the police look for a connexion. The clues available include a small, brightly painted key to the old man's safe, and some wigs found in an abandoned apartment near a crime site.
A rich man's secretary/fiancée is harassed by an assistant, who's sacked. Dangerous accidents start occurring and the assistant is suspected, but he's suddenly murdered just as he plans to meet with a Scotland Yard inspector.
A cracked safe seems like routine to the police, until the owner of the business is found dead the next morning and they find that a lot more money was in the safe than he had said. Where did he get it and why was it there?
Wally Sanders, a horseracing jockey, loses a race and crashes his car to claim an insurance. Jim Matthews, a shrewd and energetic insurance investgator, follows up the company's suspicion of foul play and stumbles deep into a web of corruption concering fixed horse races.
A body found in the River Thames is of an archaeology professor, murdered over three small fragments of an ancient text that could serve as a pretext for a red China-like country to invade a Nepal-like country.
Curzon employs the brash and confident Logan to save his ailing business. However Logan's confidence is not matched by his ability and his desperate measures lead to a life threatening situation.
With his marriage failing, a man hires a German assassin to murder his wife, who he suspects is having an affair. Things seem to go to plan at first, until the assassin decides not to kill the woman, but rather kidnap her, while still collecting his fee for the job. The husband wants proof of the murder (a body) before he pays. Things go wrong for both men when proof is not forthcoming.
Supt. Meredith is determined to bring a team of wealthy blackmailers to book. As he piles on the psychological pressure, the criminals begin to look for ways to betray each other and escape with a fortune in diamonds.
A victim's boyfriend sneaks into a blackmailer's flat to sort him out, but another man's already there, and both don't realise the crook has been murdered before they got there. The police soon arrive, tipped off in advance.