The first season of Dalgliesh, which stars Bertie Carvel (Babylon and Doctor Foster) as the titular detective inspector created by novelist P.D. James, is now available on streaming service Acorn TV. If you’re interested in enhancing your Dalgliesh knowledge, or loved the series and are looking for more cases to obsess over, here are five of P.D. James’ novels that we recommend scrounging through your local book shop for.