Prudent Jana and impetuous Sofia were best friends when they were schoolmates. One day Sofia approached a man in a car when she shouldn't have and ended up being raped by a nefarious Communist Party bigwig. Jana pursued the culprit's car, identified him, and vowed someday to bring him to justice.

Now Jana is a commander in the Slovak police force and Sofia, having made her name as a reformer, is a member of Parliament. Jana has fallen in love with an upright government prosecutor and Sofia is carrying on a notorious affair with a suave, married fellow MP.

One day Jana finds an enormous diamond dangling from a string fixed to the ceiling of the living room of her house. Was it put there as a present? Or, more likely, to entrap her? Where did this magnificent jewel come from? And why was it left for her to find? The answer leads Jana across Europe to unravel a criminal conspiracy involving multiple murders which has entangled her hapless, impulsive friend, Sofia, in its web, and ultimately to the criminal mastermind, the onetime Communist Party boss.

Genre: Mystery