King, a trafficked lion cub, escapes from the airport in mid-transit and finds shelter in the home of Inès and Alex, 12 and 15. The siblings come up with a crazy scheme: to bring King back to Africa. Unfortunately, the customs agents on their tail don't make their mission easier. But soon, Max, the kooky grandfather they've only met twice before, joins their adventure... and from then on, the sky's the limit.

莉拉16岁的早晨，就跟往常一样，不小心贪睡了一点，但今天稍微有些不一样，没人敲她房门催促她快点起床。等她终于清醒，却遍寻不着她的父母。莉拉出门却发现不但邻居、整个小镇、社区甚至整个城市，都找不到半个活生生的人影，所有的人都消失了。面对宛如世界末日的情景，莉拉陷入了自己是某场灾难唯一幸存者的恐慌，然而，在她跌跌撞撞的同时，她终于和其他4名青少年相遇了……
　　5名少年少女试着在寂静无声的世界生存，然而，究竟是什么原因带走了其他人？又有什么潜伏在暗处，兴味盎然地观察着他们呢？