一名针对小女孩作案的连环杀手（Peter Lorre 饰）出没，城中人心惶惶。警察全体出动，频繁突击检查。黑帮首领（Gustaf Gründgens 饰）因生意受到严重影响，决定利用乞丐的隐蔽性布下天罗地网。卖气球的盲丐（Georg John 饰）通过《在妖王宫中》的口哨声辨出了杀手，他的同伙（Carl Balhaus 饰）趁机将“Mörder”的首字母“M”标记在其背上。虽然警方锁定了杀手的住处，但杀手被乞丐围困于商业大厦，成了瓮中之鳖。深夜，在黑帮私设的法庭上，杀手会为自己作出怎样的辩护？
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