When Rivera and Rex are called to investigate a double murder case, they find a baby girl inside a van. This leads them to uncover an illegal adoption racket, secretly run by a non-profit adoption agency. While trying to solve the case, Rivera and his colleagues at the police station are literally left holding the baby.

When a girl answers a cry for help, she finds a man locked in the boot of his car along with his wife, who's been stabbed to death with a Serbian army knife. Inspector Rivera and Rex are called to investigate and focus their attention on the knife and a possible connection to the Serbian army.