November 1983: Three hundred feet beneath the Atlantic, US submarine Lieutenant Bill Guth and his fellow officers suddenly receive the order they've long-dreaded - to launch their nuclear missiles in a retaliatory strike against the USSR. But in the unexpected chaos that follows, one person on board lies dead...
Norfolk, England, November 2019: Bill is celebrating Thanksgiving with his four daughters and his English son-in-law when they are interrupted by a historian who turns up unannounced to ask about a near-apocalyptic incident back in 1983. And the death that prevented it. Bill smiles but does not respond – the details are classified – and the historian leaves, unenlightened. That night, the historian is brutally murdered in the local pub.

Bill and his family are thrown under suspicion. What happened all those years ago? Just how much is Bill to blame for events in the past, and indeed the present? As the layers of history reveal themselves, it becomes clear there is a killer at work who will stop at nothing to keep the secrets of 1983 where they belong...
'Deadly state secrets and deadlier family secrets - perfectly crafted, scrupulously researched Launch Code weaves an ingeniously dark and tangled web that will keep you gripped and guessing to the very end. Ridpath is one of the best thriller writers around.' - Craig Russell, author of The Devil Aspect