At a skating rink a teenage girl collapses and dies after arguing with her brother. Elsewhere a man, who's wife is expecting their first child, buys a softdrink and he too collapses and dies. Moser begins to believe someone wants the softdrink company out of business, but no one there is talking.

Diana Markus, a convicted killer, uses a man named Bergmann to break her out. He started writing to her in prison and believes himself to be in love with her. It doesn't take Moser long to track them down, but it is Rex who must provide Moser with a view into the room to make sure all goes without anymore deaths.