After his friend suspects something strange going on at the launch facility where they both work - and then goes missing - Martin Hepton doesn't believe the official line of "long-term sick leave"...

Refusing to stop asking questions, he leaves his old life behind, aware that someone is shadowing his every move.

The only hope he has is his ex-girlfriend Jill Watson - the only journalist who will believe his story.

But neither of them can believe the puzzle they're piecing together - or just how shocking the secret is that everybody wants to stay hidden

A gripping, page-turning suspense masterclass - experience the brilliance of the iconic Ian Rankin.