My first copy of Nicholas Monsarrat’s The Cruel Sea was a twelfth birthday present, given to me in 1956. It was Cassell’s expurgated ‘Cadet Edition’, intended for a generation who knew little about the war during which they had been born. While Monsarrat’s publishers thought we should be acquainted with the Battle of the Atlantic, they clearly considered that we would come in our own time to adultery and what was then breathlessly referred to as ‘premarital sexual intercourse’. What mattered was access to Monsarrat’s brilliant evocation of a grim campaign at sea. I read it as I bumped into school on the Northern Line and have been haunted by it ever since.