Heldt's car breaks down on the way to a course imposed by captain Grün, so they drop it at slick welcoming mechanic Tobias Wachowiak's cheap garage. Continuing in his loan car, they must stop for the non-fatal crash of Meike Behling to hospitalize her, and hear the breaks were sabotaged before finding Tobias fatally crushed under Heldt's car. Gardening for Meike's generous grandma and landlady and questioning her suspiciously absent boyfriend Thomas Pischzek, Heldt can't resist meddling in Grün's questioning of Tobias's ex Michaela and catching her picking up cash from the garage. A long-running fraud connects both cases.