Five rather frivolous musicians seize the opportunity to perform on a cruise in the Mediterranean. Alas: they are under contract to engage a female singer - and they fear to fall in love with her, which would endanger their friendship.

The film follows the occasionally slapstick misadventures of Sergeant Sestig, a fire brigade sergeant and widower, with his attractive daughter Martje by his side. At one point, three women attempt to woo him as a husband, but after a whirlwind of panic-filled complications, Sestig decides, with quiet resolve, to remain a dedicated firefighter—and a widower..