Vigilantes(1993)

A group of seven friends of different ages and interests meet regularly at Eva's. They have coffee, talk and listen to music. At one of the gatherings, Eva finds a secret agent's badge, "Lookout 123", in the hallway. The accidentally dropped ID card can only belong to one of the members of the party. From that moment on, the film is a continuous chain of private investigations, suspicions, betrayals, deceptions, the fabrication of hypotheses, the chess game of thinking through all the motives that are supposed to be relevant.