John Taylor lives in quiet solitude, designing puzzles for a living, under the nom-de-plume of 'Ludwig'. When his identical twin, James, disappears off the face of the earth, John takes over his brother's identity in a quest to discover his whereabouts.

• David Mitchell
• Anna Maxwell Martin
• Dipo Ola
• Gerran Howell
• Izuka Hoyle
• Dorothy Atkinson
• Sophie Willan
• Dylan Hughes