Zachary Pikus is an inventor fleeing from the government and drinking himself to death.
Xi Wu is a girl running amok 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 against a Rogues' Gallery of fake spiritualists and UFO-chasers, while the world crumbles around them?
The answers to these questions are uncovered in Those Who Know, an Andy Comb Mystery.