In her book The Suspicions of Mr. Whicher (2008), Kate Summerscale revisits a murder that gripped England in 1860. On June 29 of that year, someone crept into the nursery in Samuel and Mary Kent’s home and kidnapped Saville, their three-year-old son. Hours later, the child was discovered dead in a privy-house on the grounds, his throat slit. Was it done by a stranger? Or a member of the household? Called to the case was the celebrated Detective Inspector Jonathan Whicher of Scotland Yard. Alexandra Wood has adapted the whodunnit for the stage, and the show debuts at Watermill Theatre. —Jensen Davis