保安贾东南与张西北在一个夜晚抓住了被警方通缉的摩托飞贼。在向小区业主归还失物时却闯入赌局，形成对峙，最终导致一名女性死亡。两人承担责任被公司开除。失业后两人分道扬镳，为各自理想奋斗。贾东南当上了侦探，张西北下海经商，成为了一个土豪。五年后，贾东南的侦探社生意凋零，张西北则面临破产。而这时，张西北新交往的网红女友小敏遭到绑架，急切的张西北找到贾东南寻求帮助。一场惊心动魄悬念丛生笑果频出的破案之旅即可展开。
Four friends on vacation discover that their isolated rental property is already occupied by a seemingly friendly older couple. A night of unimaginable terror ensues…
Repeat visits from an owl convince Paula in the gnome's reincarnation, Iván can't believe he killed a man, Fermin fights for his life while losing the paintings, the gang discovers a second door, and Saúl preps a new operative.