Young lawyer Mia Stocker takes up her first job at her father's renowned law firm. Her first case seems to be routine: An elderly gentleman dies in a nursing home due to incorrect medication. But this is actually just the beginning of a major scandal.

Sadisticum tells the story of a man for whom there seems to be only one purpose in life, the torture and killing of others. At age 17, he has already killed two people. But he manages to suppress his appetite for many years. Half of his life he spent with working and adapting the company externally. But the void in his life has been increased steadily, until one day it happens again, he kills. Only this time he would not stop, this time he would give free rein to his appetite. But even by the brutal killing of his fellow man, he learns no more satisfaction. His ever-growing need for recognition is driving him to create some kind torture course. He'd selected peers point to which way is best torturing anyone without killing him early. But it does not stop at a seminar, his addiction to attention and admiration grows into the vast, ever more cruel torture methods he tried. But one day, the story takes a surprising turn ...

Actually, Kathi should be happy: her best friend Caro marries and wishes on top of Kathi as a maid of honor. Would not it be the unspeakable coincidence that the wedding is also Kathi's ex-boyfriend Markus and his new super-girlfriend Maria invited. For Kathi it is clear: She has to find a companion for Caro's wedding. Easier said than done: All conceivable men in their circle of acquaintances are already taken. So Kathis way leads to the brokerage "Datelink". Already at the first meetings she receives illustrious, colorful and absurd insights into a generation of men in search of the woman for life.