Reluctantly, psychiatrist Wendelin Winter accepts a short interim for a colleague at the Tegernsee, while daughter Alexandra joins a wild party. Eager to keep an eye on her, he's happy when commissioner Ackermann asks him back him for a murder in Münich. Schlager-song star Ronny König is prime suspect for the murder in a hotel elevator of a pushy fan who stalked him. Attending his next concert, Wendelin witnesses wheelchair-ridden ex-singer Romana threatening to expose Ronny's old secret, a day before she's found drowned in her pool. Lush Ronny's devoted manager Maximilian makes a confession which doesn't convince Wendelin. His colleague's patient file include Ronny's stalker-obsessive crone fan-club president Gudrun Kessler.