Lethal White Robert Galbraith Sphere. Out now

JK Rowling wields her magic pen again in this fab fourth instalment of the Cormoran Strike series, now a hit BBC drama.

This time the case is set in the world of politics and sees Strike’s business partner Robin go undercover at Westminster as they investigate the blackmail of a Tory minister.

With the will-they-won’t-they romantic tension between the leads, a merciless skewering of certain characters and a fast-moving plot, make this hugely absorbing, dryly witty story the best Strike novel yet.