Abi keeps them safe.

One hundred and twenty-two islanders and their three beloved scientists live in harmony, kept safe from a poisonous security barrier with the help of Abi's instructions.

Niema keeps the islanders occupied.

Niema is one of the scientists who remembers what life was like before the fog. She ensures that all of the islanders have a job to do, and everyone loves her. Almost everyone.

Emory can't stop asking questions.

But then one of the scientists is found dead, and their murder triggers the dropping of the security barrier. The only way to reinstate it is to find the killer. But can Emory ask the right questions?

They have 107 hours to solve the murder before the fog sweeps in. Can they stop the end of their world?