In the shadow of war, a young woman must choose: deny her magic or wield it to stop a traitor before Britain falls.

England, 1939. A young witch. A nation at war. A spy hiding in plain sight.

As war looms over Britain, Eliza MacLean wants nothing more than an ordinary life. Raised on the Isle of Mull, she’s spent years denying her gifts—just as her mother insisted. But her grandmother taught her differently, whispering ancient knowledge of herbs, charms, and spells.

When her grandmother dies, Eliza seeks refuge in Cambridge with her cousin and the women of the WVS. But beneath its spires and blacked-out streets, Cambridge hides more than just scholars and soldiers. A secret network of witches is working to protect Britain from an enemy who knows magic is real—and seeks to weaponise it.

Drawn into the fight, Eliza is thrust into a world of espionage, deception, and occult warfare. Her rare abilities catch the attention of MI5 agent Alex Fletcher, who needs her help to unmask a deadly spy before it’s too late.

As she learns to harness her power, Eliza finds herself torn between duty and love, risking everything for Jim, a fighter pilot whose fate seems written in the stars. But war is ruthless, and magic has a price.

With the spy closing in and the war reaching new heights of peril, Eliza’s only hope of saving those she loves is to embrace the very magic she’s spent a lifetime hiding—no matter the cost.

But some powers were never meant to be used.

Perfect for fans of A Discovery of Witches and The Rose Code, Her Darkest Hour blends historical fiction with supernatural intrigue in a gripping tale of war, witchcraft, and sacrifice.