After tragedy strikes their only ally within the government, the team is left on their own to stop a surge of animal-related attacks from destroying the city of Geneva, Switzerland. Also, new team member Dariela makes a shocking discovery about General Davies, head of the Noah Objective, and in the Canadian wilderness, Jamie witnesses the animals' broadening effect on the environment and uncovers a troubling detail about Logan.
Zoo is set amidst a wave of unhappy animal attacks sweeping across the planet. A young renegade scientist is thrust into a race to unlock the mystery behind this pandemic before time runs out for animals and humans alike.