Moscow, 1936. In a deconsecrated church, a young woman is found dead, her mutilated body displayed on the altar for all to see. Captain Alexei Dimitrevich Korolev is asked to investigate. But when he discovers that the victim is an American citizen, the NKVD - the most feared organisation in Russia - becomes involved. Soon, Korolev’s every step is under close scrutiny and one false move will mean exile to the frozen camps of the far north. Committed to uncovering the truth, Korolov enters the realm of the Thieves, who run Moscow’s underworld. 

Inspector Max Betancourt is working a new beat, one he didn’t ask for. Following the disappearance of his wife, his life and career have fallen apart. Once a rising star of Singapore CID, Betancourt has been relegated to the Marine Division, with tedious dockyard disputes and goods inspections among his new duties.

Only she knows the truth. Only he can tell the world. Vienna, 1946. A brilliant German scientist spirited out of the ruins Nazi Europe in search of a new life. Moscow, 1964. A rising star of the British diplomatic service whose job is not what it seems. London, the present day. A once promising academic offered an opportunity to seal his place in history. Their stories, their lives, and the fate of the world, are bound by a single document: The Scarlet Papers. The devastating secrets contained within teased by a brief invitation: Tomorrow 11AM. Take a cab and pay in cash. Tell no one.

Summer, 1943. Daniel Berkåk works as a courier for the Press and Military Office in Stockholm. On his last cross-border mission to Norway, he carries a rucksack full of coded documents and newspapers, but before he has a chance to deliver anything he is shot and killed and the contents of his rucksack are missing. The Norwegian government, currently exiled in London, wants to know what happened, and the job goes to writer Jomar Kraby, whose first suspect is a Norwegian refugee living in Sweden, whose past that is as horrifying as the events still to come.

As India celebrates the arrival of a momentous new decade, Inspector Persis Wadia stands vigil in the basement of Malabar House, home to the city's most unwanted unit of police officers. Six months after joining the force she remains India's first female police detective, mistrusted, sidelined and now consigned to the midnight shift. And so, when the phone rings to report the murder of prominent English diplomat Sir James Herriot, the country's most sensational case falls into her lap.