Picking up from where things were left at the end of series one, master puzzle-setter John ‘Ludwig' Taylor is now a Crime Scene Consultant working on ‘impossible' crimes for the Cambridge Police Authority. No longer having to masquerade as his brother, he's openly more ‘Ludwig' than ever - brilliant at solving puzzles but hopeless at everything else.

But John's identical twin brother, James, is still missing, and now that he's an official employee of the station, John is forbidden from using any police resources to look for his brother or uncover exactly what he was investigating.

Of course, John won't stop and neither will Lucy, John's sister-in-law and wife of his missing brother James - a puzzle needs solving and a husband and father needs bringing home. One masquerade may have ended, but a new one has just begun.

When John ‘Ludwig' Taylor's identical twin, DCI James Taylor, disappears off the face of the earth, John takes over his brother's identity in a quest to discover his whereabouts. John has never married; never had a family and never really ventured further than his own front door. Without a computer, mobile phone or even a television, he lives in quiet solitude, designing puzzles for a living, under the nom-de-plume of ‘Ludwig'.

This genre bending detective series follows full-time luddite, John 'Ludwig' Taylor, as he assumes the identity of his missing twin brother in a bid to track him down and bring him home. However, filling the shoes of your identical twin is one thing - when your twin also happens to be a successful DCI leading Cambridge's busy inner-city major crimes team the stakes are much higher. John may be a master of all things cryptic, but can he crack the biggest puzzle of his life?