Laurenz, his sister Marie and the other Pfefferkörner are outraged: the letterbox in which they threw the carefully collected signatures against animal testing has been blown up by strangers. But there is also a lot of “explosive material” among the peppercorns. Laurenz discovers a love letter that Karol wrote to Yeliz and is furious. He feels betrayed by Karol and Yeliz and wants nothing more to do with either of them. Laurenz works doggedly to convict the mailbox bombers. He will only tolerate the cooperation of Marie and Lilly, who are very worried that the Pfefferkörner will break up as a team. The two letterbox bombers soon suspect that someone is on to them and want to destroy all evidence as quickly as possible with a bomb that they have placed in a dilapidated old building.
Laurenz, his sister Marie and the other Pfefferkörner are outraged: the letterbox in which they threw the carefully collected signatures against animal testing has been blown up by strangers. But there is also a lot of “explosive material” among the peppercorns. Laurenz discovers a love letter that Karol wrote to Yeliz and is furious. He feels betrayed by Karol and Yeliz and wants nothing more to do with either of them. Laurenz works doggedly to convict the mailbox bombers. He will only tolerate the cooperation of Marie and Lilly, who are very worried that the Pfefferkörner will break up as a team. The two letterbox bombers soon suspect that someone is on to them and want to destroy all evidence as quickly as possible with a bomb that they have placed in a dilapidated old building.