Every day, many dogs and cats in the city are stolen by animal hunters. Locke and Tom, both passionate animal lovers, begin the hunt for the culprits and stumble upon such horrific facts that tears well up in Locke's eyes.
A robbed bank robber leads Tom and Locke onto the trail of a gang operating under a nasty guise. They use telephone conversations to mislead their victims, then trap and rob them. Tom and Locke suddenly find themselves in mortal danger.
A horrible gift has been buried. Tom and Locke follow the trail. But they have no idea what they've let themselves in for. As soon as the perpetrator realizes they have evidence, it becomes clear: He won't even shy away from murder.
The well-liked Grandma Meyer is threatened by uncanny events. Who wants to scare her so badly that she has a heart attack? Tom and Locke try to help Grandma Meyer. They have no idea what terrible dangers lie ahead.
Gunter Rehm, editor-in-chief of the newspaper "Tagblatt", is on the trail of a dangerous gang. Ultimately, the gang doesn't even shy away from attempting murder. Tom and Locke find themselves in the middle of the case.
The Mafia is on the loose. Italian restaurateurs are being harassed, and Tom and Locke feel challenged. Despite dire warnings, they get involved with the world's most dangerous gangster organization.
Locke's father, Gunter Rehm, is warned. He is in mortal danger. A criminal who has just been released from prison has sworn bloody revenge. Indeed, the criminal soon appears and proves he has no mercy.
Tom stops two teenage burglars. He makes a mistake: The burglars' loot - a suitcase full of counterfeit money - flies into the river and sinks. This triggers an uproar in the underworld. The city's criminals hunt him and Locke.
Surprising news for Tom and Locke: Their friend Toni is actually Markus Köhler - and he would inherit millions if he could prove who he really is. But the evidence is in criminal hands, and the fiend is determined to destroy it.
Sabine is kidnapped and Judge Schwörle is attacked. Kotter, who is on leave, is the only possible perpetrator. But then Kotter's leave is over and the terror is really starting. If Kotter didn't carry out the attacks, then who did?
The Terror Gang is bulldozing the city. What's behind it? And what connects skinhead "Scar" Knosky and the unemployed Gero Reichard? Tom and Locke soon realize how dangerous this gang is. Any crime seems to be acceptable to the skinheads.
Locke has been kidnapped. Locke's father, her brother Mike, her friend Tom, and his mother, Dr. Conradi, are helpless in the face of a ruthless criminal. They must all make great sacrifices if they want to free Locke.
