A crocodilian, a creature from the Eocene period which was mistaken for a god and worshipped in ancient Egypt is released through an anomaly whilst on display at an Egyptian exhibition at the British Museum. It kills the curator, Marion and flees across London, diving into the Thames. Cutter recruits Dr. Sarah Page, Marion's assistant, to help his team retrieve it.

The team discover a creature that can camouflage itself at an abandoned house. As they investigate, they cross paths with an interfering cop. Meanwhile, their headquarters is infiltrated by someone who should have been dead.

The team must dispose of a number of diictodons, cute-seeming but malevolent burrowing creatures who appear via an anomaly in a hospital, where they cause a power failure by biting through cables. Mick Harper, a nosey journalist, takes an interest in the team's work. The diictodons are disposed of but Helen Cutter makes a clone of her husband in order to enter the ARC and find out more about an artefact she has stolen.