The U-boats are inside the convoy. And someone is helping them get there.

In the deadly waters of the Battle of the Atlantic, British merchant ships are being sunk with terrifying efficiency. German submarines are somehow penetrating the convoys undetected; striking from within before vanishing back into the darkness.

Lieutenant Ned Yorke is ordered to discover how.

His suspicions soon fall upon a mysterious neutral vessel that has appeared alongside more than one doomed convoy. To uncover the truth, Yorke must join a Freetown-bound convoy and enter a deadly game of deception in which one mistake could betray him to the enemy.

As the merchant ships push south through U-boat-infested waters, Yorke races to expose the secret before the Germans strike again. For somewhere among the ships of the convoy is the key to their destruction...

... and an entire convoy is sailing straight into the trap.

Tense, authentic and packed with submarine warfare, espionage and high-seas action, Convoy is a gripping Second World War naval thriller from the bestselling author of the Lord Ramage novels.