The story of an obsession. When cycling commentator Ned Boulting bought a length of Pathé news film featuring a stage of the Tour de France from 1923 he set about learning everything he could about it - taking him on an intriguing journey that encompasses travelogue, history and detective story.

In the autumn of 2020 Ned Boulting (ITV head cycling commentator and Tour de France obsessive) bought a length of Pathé news film from a London auction house. All he knew was it was film from the Tour de France, a long time ago. Once restored it became clear it was a short sequence of shots from stage 4 of the 1923 Tour de France. No longer than 2.5 minutes long, it featured half a dozen sequences, including a lone rider crossing a bridge.

Ned set about learning everything he could about the sequence - studying each frame, face and building - until he had squeezed the meaning from it. It sets him off in fascinating directions, encompassing travelogue, history, mystery story - to explain, to go deeper into this moment in time, captured on his little film.

Join him as he explores the history of cycling and France just five years after WWI - meeting characters like Henri Pélissier, who won the Tour that year but who would within the decade be shot dead by his wife's lover. And Theophile Beeckman - the lone rider on the bridge.