The Great Alibi

Senator Henri Pages invites his family and friends to spend a weekend at his luxurious estate. But there is tension within the group, mainly because of Pierre, who is a psychiatrist by profession, and his affairs. Particularly delicate: his mistress Marthe and his wife Claire find themselves under the same roof. When the glamorous Italian actress Lea Mantovani, a former lover who is trying to win Pierre back, also shows up, the chaos is complete. Meanwhile, the senator proudly shows off his collection of firearms, and when Pierre is found shot dead the next day, it all looks like a crime of jealousy. Pierre's wife is suspected and interrogated. But soon the question arises: Was the crime really as simple as it seems at first glance, or was something deliberately staged here? The police investigate, and so does the motley crew with their complicated relationships and various possible motives.