Sherlock faces his biggest challenge of all – delivering a Best Man’s speech on John’s wedding day! But all isn’t quite as it seems. Mortal danger stalks the reception – and someone might not make it to the happy couple’s first dance. Sherlock must thank the bridesmaids, solve the case and stop a killer.

• Steven Moffat
• Arthur Conan Doyle
• Mark Gatiss

• Martin Freeman
• Georgina Rylance
• Toby Jones