Zachary Pikus is an inventor running from the government and drinking himself to death.

Xi Wu is a girl wreaking havoc with a nuclear weapon after leaving a terrorist cell.

They are Those Who Know.

What do they know? How do they know it? Why must they struggle with fake spiritualists and UFO-chasers, while the world crumbles around them?

The answers to these questions are revealed in Those Who Know, an Andy Comb Mystery.