Season 4 kicks off with the Warehouse Team still reeling from the shocking events of the climactic season three finale – the loss of Agent Steve Jinks, Mrs. Frederic, H.G. Wells, and the destruction of the Warehouse itself. Their only hope lies in racing to the other side of the Earth to hunt down an obscure artifact, which may or may not even exist – and if it does exist, what consequences will they face for using it?