Sebastian is an undisciplined mathematics genius who works in the "cipher bureau" of the British Intelligence. While cracking enemy codes, Sebastian finds time to romance co-worker Rebecca Howard.

From the Louis Hemon novel "M. Ripois and His Nemesis" about Andre Ripois, a philanderer in pursuit of love and riches from Paris to London. Andre is breaking up with his wife, Catherine, over his attentions to her best friend Patricia. While Catherine is out arranging the divorce, Andre, just to keep in practice, hits on the girl upstairs, Diana and then turns his attention back to Patricia, who he tricks into having dinner at his flat on the pretext that Catherine will be there. When he cannot make any progress with her via his usual tactics, he tries to arouse her pity be telling her of his past. In his early, impoverished days in London, he made love to his boss Anne but her dreadful cooking drove him away. Next came Norah who he picked up on a bus and took to his flat and told her about his make-believe inheritance, but she insisted on marriage first, which was not in his plans. Marcelle, a French woman living in Soho, put him on his feet with money, and he repaid her by stealing fifty pounds and running off. He met the wealthy Catherine at his flat where she came to be tutored in French lessons, and ended up marrying him. But, even at his wedding, he had eyes only for Patricia and, he tells her she is his one true love.

Vivian Kenway, a young Englishman from an aristocratic background, flunks out of Oxford, and decides to use his considerable charm to achieve his goal of, apparently, making dissipation his career. His derelictions include seduction, betrayals of sweethearts, family and friends, and Marriage for money. All this with no signs of remorse or redemption, since his life as a completely unprincipled rake is quite enjoyable...for him, at least. Then, World War II breaks out and he is given a chance to die a heroic death for flag and country. Maybe.

Successful businessman Joe Lampton is married to the wealthy Susan, has two children, and lives in the mill town of Warley in northern England. But his career seems to have plateaued, leaving him disillusioned. This feeling is only exacerbated when he discovers his wife's infidelity with local man Mark. So he takes up with attractive TV host Norah and moves with her to London, aiming to reignite the fire that drove him to the top.

Now old, ill, poor, and largely forgotten, William Freise-Greene was once young and handsome William Green. He changed his name to include his first wife's for the photographic portrait work he excelled at. But he was also an inventor and his search for a way to project moving pictures became an obsession that ultimately changed the life of all those he loved.