London, 1931. The night before an exhibition of his artwork opens at a famed Mayfair gallery, the controversial artist Nick Bassington-Hope falls to his death. The police rule it an accident, but Nick's twin sister, Georgina, a wartime journalist and a infamous figure in her own right, isn't convinced.
When the authorities refuse to consider her theory that Nick was murdered, Georgina seeks out a fellow graduate from Girton College, Maisie Dobbs, psychologist and investigator, for help. Nick was a veteran of World War I, and before long the case leads Maisie to the desolate beaches of Dungeness in Kent, and into the sinister underbelly of the city's art world.
In Messenger of Truth, Maisie once again uncovers the perilous legacy of the Great War in a society struggling to recollect itself. But to solve the mystery of Nick's death, Maisie will have to keep her head as the forces behind the artist's fall come out of the shadows to silence her.