After his handler is killed, police dog Rex teams up with recently-divorced inspector Richard Moser to investigate crimes and solve mysteries on the streets of Vienna. And they sometimes get help from their two-legged friend, Inspector Stockinger.

Lawyer Fröhlich has specialized in divorce cases and has become a star in this field. Along the way, he also divorced his own marriage. But his daughter and former wife are an integral part of his life, as is his marriage-mad father.