The first of six crime movies based on the early novels of prolific Swedish crime novelist Maria Lang, written in the late 1940s and early 1950s. Puck Ekstedt has been invited by her university tutor to celebrate midsummer at his summer house on a secluded island, together with a group of friends including Einar Bure. Puck and Einar are secretly courting and he is the reason she accepts the invitation. The summer nights are seductively beautiful until Puck finds one of the female guests murdered.
