Dora and Rex 1920s Mysteries Books in Order

The Dora and Rex 1920s Mysteries trace the partnership between two very different people whose lives are reshaped by war and espionage. Before the roaring twenties arrive, readers meet them in Murder at the Front, a World War I prequel set in Le Touquet in 1918.

There, Lady Dorothy enters a marriage of convenience, fully aware it is more contract than romance. When her new husband is gunned down during a secret mission, she is left widowed overnight, furious, and surrounded by unanswered questions. An injured officer named Rex Bankes‑Fernsby is the only survivor, and together they begin to suspect that someone on their own side wanted the mission to fail.

By the time Murder, I Spy opens, the calendar has flipped to 1922 and London is buzzing. Dorothy has reinvented herself as Theodora Laurent, a glamorous femme fatale and undercover spy who can drift through Mayfair drawing rooms and Soho clubs with equal ease. Rex is a charming aristocrat trying to drown his battlefield nightmares in fast cars and late nights. When his friend Freddie is killed under suspicious circumstances, he turns to Dora for help and is pulled into the shadow world she already inhabits.

Their investigations continue through a series of high‑stakes cases. In The Missing Agent, a leak inside the Cabinet, the murder of a fellow spy, and the kidnapping of London's spymaster turn a simple assignment into a life‑or‑death race. Death Undercover sends them to Rex's family manor for a country‑house weekend with a suspected foreign agent, who does not survive long enough to answer questions. Double Cross Dead moves even closer to the throne as an enemy embeds himself in the prince's inner circle during a royal celebration at Windsor.

Later books such as The Roman Riddle, The Cryptic Cold Case and Murder in the House take the pair to Rome and back to Westminster. Each mystery balances personal stakes with political ones: the future of alliances, the stability of government, and the cost of keeping secrets in the name of national security.

The tone blends Golden Age mystery puzzles with fast‑paced spy fiction. Dora and Rex bicker, flirt, and save each other's lives while trying to decide how much they can afford to trust anyone, including themselves. If you enjoy historical mysteries that mix Jazz Age glamour, espionage, and evolving relationships, this series delivers that combination.