A writer of both adult fiction and non-fiction, he is known for the Bernhard "Bernie" Gunther series of historical thrillers set in Germany and elsewhere during the 1930s, the Second World War and the Cold War. He also wrote children's books under the name P. B. Kerr, including the Children of the Lamp series. Kerr wrote for The Sunday Times, the Evening Standard, and the New Statesman. He was married to fellow novelist Jane Thynne; they lived in Wimbledon, London, and had three children. He died from cancer on 23 March 2018, aged 62. Just before he died, he finished a 14th Bernie Gunther novel, Metropolis, which was published posthumously, in 2019.