未解之谜 第四季是一部悬疑,纪录片,犯罪片，这部扣人心弦的标志性纪录片系列重磅回归，带您走进蹊跷神秘的失踪事件、令人震惊的谋杀案和超自然的遭遇。
London, 1888. The city is gripped by a string of murders, each more gruesome than the last. Experts delve into one of history's most notorious mysteries.
