Cast off by her family, she married a banished duke in her stepsister's place—with her son. When he awakened a storage power, they stripped the duke's manor bare under the guards' noses and stole her family's secrets. Her hidden agent skills shielded them from a cruel officer. In the frozen North, as everyone starved, she pulled warm feasts from thin air. But when a madman recognized her tattoo, the truth behind the duke's treason unfolded.