
7.7
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.
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1Episode 1Episode 1
58 min
Puzzle setter John ‘Ludwig’ Taylor’s life is upended when his identical twin, DCI James Taylor, disappears. John reluctantly assumes his identity in order to track him down.
2Episode 2Episode 2
58 min
On a mission to crack the code in his twin’s notebook, John returns to the police station. A frustrated Lucy takes matters into her own hands and plays detective herself.
3Episode 3Episode 3
59 min
A new case takes Ludwig on a walking tour of Cambridge, where he’s faced with an impossible question. Meanwhile, Lucy goes undercover and makes a grim discovery of her own.
4Episode 4Episode 4
54 min
A body falls from the fourth storey of a construction site. Was it just a terrible accident, or a perfectly executed murder? When things don’t add up, John questions his abilities.
5Episode 5Episode 5
58 min
John and the gang go back to school to investigate the suspicious death of a headmaster. Lucy sneaks off on a covert mission, and a shocking revelation leaves John reeling.
6Episode 6Episode 6
59 min
A cryptic late night call from Holly sees Lucy lured into danger. Back at the station, all eyes are on John as the pressure ramps up. Will his cover finally be blown?

David Mitchell
John 'Ludwig' Taylor / James Taylor

Anna Maxwell Martin
Lucy Betts-Taylor

Dipo Ola
DI Russell Carter

Gerran Howell
DC Simon Evans

Izuka Hoyle
DS Alice Finch

Dorothy Atkinson
DCS Carol Shaw

Sophie Willan
Holly Pinder

Dylan Hughes
Henry Betts-Taylor

Ralph Ineson
Chief Constable Ziegler