Magnus and Will both have their reasons for tracking down a young boy who disappeared after behaving strangely at the scene of a murder.

Will is drawn further into Magnus's mysterious world and finds himself confronting his oldest fear. Then Magnus must confront her own past and consider a dangerous deal with the sinister Druitt.

When three women are rescued from a mysterious crypt in Scotland, their disappearance does not go undetected by a powerful cabal, determined to reclaim what they believe is theirs.

An investigation into a bizarre robbery in which the thieves disappeared without trace reminds Will of a case he worked on with the FBI but could never solve.

Returning with an abnormal captured in the Himalayas, Magnus, Will and their colleague Allison Grant are stranded when their plane goes down in a desolate mountain range. While anxiously waiting for a rescue team, the passengers fall victim to a series of deadly attacks and vivid nightmares, and it becomes apparent that surviving the freezing temperature is the least of their worries.

When a pair of cute, furry creatures discovered in the hold of a bio research vessel are brought in to be studied, the team start to exhibit a strange animal attraction for each another.