H.M.S. Unseen by Patrick Robinson

When the British attack submarine H.M.S. Unseen mysteriously disappears during a training exercise, the world assumes it has met with disaster. But months later, a U.S. airliner vanishes over the Atlantic — followed by another, and another — leaving no trace but chaos and fear. Behind it all is one man: rogue submarine commander Ben Adnam, a naval genius turned terrorist mastermind. As the hunt intensifies across oceans and continents, the race begins to stop a deadly plan that could bring the world to its knees. Taut, explosive, and chillingly plausible, H.M.S. Unseen is a gripping naval thriller of strategy, vengeance, and deception on a global scale.