Murdered fitness club-owner Martin Keuerleber's polyamorous contacts are investigated, staring with fresh widow Stefanie Keuerleber, as neighbors believe their marriage was ailing with violent fights. Polyamorous neighbors Luise Bergmann, Mark Schildt and Daniel Mommsen suspiciously try to hide, Martin wrecked their art cafe dream by withdrawing his investment. All three confess having murdered him alone, neither is believed, yet two must be proven innocent. Rico's personality model algorithm gets them to talk: Daniel lacks MO know-how, Mark recently threatened the victim, yet turns out to have an alibi, leaving Luise, whose story still surprises.
—KGF Vissers