JR Moehringer grew up with a love of The Prince and the Pauper. Now he’s written Prince Harry’s memoir

Prince Harry’s ghostwriter, JR Moehringer, is a Pulitzer Prize-winning features writer whose own memoir about his absent father was adapted into a George Clooney-directed film. Now he’s turned his hand to ferreting out the most intimate details of royal life and familial intrigue, writes Sheila Flynn