Ludwig S1, E4

While seeking to unravel the mystery of his twin brother's disappearance, reclusive puzzle-designer John 'Ludwig' Taylor takes on his twin brother James's identity as DCI on Cambridge's major crimes squad.

Director: Mark Brotherhood , 

Cast:David Mitchell , Anna Maxwell Martin , Dipo Ola , Sophie Willan , Gerran Howell , Izuka Hoyle , Dylan Hughes , Dorothy Atkinson , Ralph Ineson , Jakub Bednarczyk , Hammed Animashaun , Adam Ali , Mia Austen , Heidi Berger , Jamie Beamish , Ella Bruccoleri , Stevie Binns , Tom Bell