When a British ambassador is found dead in his Daimler beneath the fog of Berkeley Square, Captain Hugh "Bulldog" Drummond knows it's no suicide-it's the calling card of a legend thought long vanished: the Crimson Widow.

From the corridors of MI5 to the glittering ballrooms of London's elite, from midnight intrigues on the Orient Express to deadly rendezvous in Berlin and Prague, Drummond is thrust into a perilous hunt across Europe. The Widow is no ordinary spy-she is a master manipulator, weaving a web of seduction, betrayal, and espionage that could topple governments and ignite a new war.

Together with his loyal comrade Algy Longworth and the sharp-witted Verity Vale of MI5, Drummond faces assassins, double agents, and shadows from his past. But the Widow is always one step ahead, her mark left in crimson silk and black lace, her motives as deadly as they are elusive.

In this high-stakes game of cat and mouse, Drummond must unravel the Widow's ultimate design before Europe is plunged into chaos. Honor, loyalty, and the fate of nations hang in the balance.

A classic Bulldog Drummond thriller of fog-choked London streets, clandestine rendezvous, and a femme fatale whose kiss is deadlier than any bullet.