The singing trio of Susanne, Dieter and Juergen work at an unsuccessful student cabaret. Mr Brenders, a rich entrepreneur offers to fund them, if they change the name of the cabaret to the Lu-Lila bar with a roaring twenties motive. Disguised in black outfits and wigs, the trio soon find out Brenders has them recreating an unsolved murder case from 26 Februari 1927 in which he himself may or may not have been involved.