因持有一名失踪公务员的护照,无家可归的14岁男孩马可在丹麦边境遭到逮捕。警探卡尔·穆尔克及其悬案组负责找出关联的线索。旧案件疑点重重:那名公务员在失踪前不久被指控有恋童癖,结案速度也异常地迅速。然而,沉默受惊的马可不愿开口交谈。他很快就从企图杀人封口的人们手下逃了出来。本片改编自丹麦作家尤西·阿德勒-奥尔森的同名小说,是其“悬案密码”系列的第五部作品。Jessica appears in a comic strip accusing various people of wrongdoing and triggering a lawsuit -- but the author insists he had nothing to do with it and his inker is killed in his studio.