After centuries of isolation, Japan opens to the West. Foreign ships threaten Edo, as American missionaries arrive, unaware of their predestined fate. With Lord Genji's prophecy, a remarkable adventure begins as a young nobleman meets a reformed gunslinger and a woman fleeing her own beauty.

Jóhanna’s book provides invaluable information on Norse history and sagas, so much so that she was one of the historical consultants for The Northman.