This paperback is D A Rayner's novel 'THE ENEMY BELOW' published by Fontana books in the UK in 1962. Book is in reasonable condition.  192 pages.  Picture is of actual book.

SYNOPSIS: The chase began when HMS Hecate's radar picked up a lone German U-boat, locking Hecate and U121 in a life and death struggle. But as the destroyer and the submarine attacked over the deserted North Atlantic the fight became a personal one between their captains. Two men driven by pride and patriotism to destroy each other.