A husband-and-wife detective team look into the murder of one of her friends, whose father--a prominent scientist--has been kidnapped. They find themselves up against a sinister crime organization headed by a mysterious figure known only as "Z".

In Imperial Russia, Anna, wife of the officer Karenin, goes to Moscow to visit her brother. On the way, she meets charming cavalry officer Vronsky, to whom she's immediately attracted. But in St. Petersburg’s high society, a relationship like this could destroy a woman’s reputation.

Lord Windermere appears to all – including his young wife Margaret – to be the perfect husband. The couple's happy marriage is placed at risk when he starts paying visits to a mysterious beautiful newcomer, Mrs. Erylnne, who is determined to make her entry into London's high society. Worse, the secret gets back to Margaret that Windermere has been giving Mrs. Erylnne large sums of money.