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.

1936 in the Crown Colony of Singapore, and the British abdication crisis and rising Japanese threat seem very far away. When the Irish nanny looking after acting governor Palin's daughter dies suddenly - and in mysterious circumstances - mission school-educated local girl Su Lin - an aspiring journalist trying to escape an arranged marriage - is invited to take her place. But then another murder at the residence occurs and it seems very likely that a killer is stalking the corridors of Government House.

Bombay, 1921: Perveen Mistry, the daughter of a respected Zoroastrian family, has just joined her father's law firm, becoming one of the first female lawyers in India. Armed with a law degree from Oxford, Perveen also has a tragic personal history that makes her especially devoted to championing and protecting women's legal rights. Mistry Law has been appointed to execute the will of Mr. Omar Farid, a wealthy Muslim mill owner who has left three widows behind. But as Perveen is going through the paperwork, she notices something strange.

England, 1920. Eleanor Swift has spent the last few years travelling the world: taking tea in China, tasting alligators in Peru, escaping bandits in Persia and she has just arrived in England after a chaotic 45-day flight from South Africa. Chipstone is about the sleepiest town you could have the misfortune to meet. But then, from the edge of a quarry, through the driving rain, Eleanor is shocked to see a man shot and killed in the distance. Before she can climb down to the spot, the villain is gone and the body has vanished.

Meet Zoe Finch, West Midlands Police's newest Detective Inspector. She's outspoken, ambitious, and damaged. And she's working a case that could make her career, or cost her everything...Fresh from the success of the Canary investigation into depravity and corruption at the highest levels, she's attracted attention. Not least from Assistant Chief Constable Bryn Jackson. But when Jackson is brutally murdered on the night of his retirement party, Zoe is dragged into a case that's deeply personal.