Lewis and Hobson are examining the body of murdered Vicki Walmsley when a theft of etorphine is reported by the Garsington Equine Centre. The drug was last used a year earlier on a horse that injured its teenage rider, Joshua Grace – the brother-in-law of Reuben Beatty, the first murder victim.

• Colin Dexter

• Perdita Weeks
• Joanna Lumley
• Art Malik