Vesper is a nineteen-year-old "voidweaver" — a walking nullification whose skin unmakes any magic it crosses — kept starved and chained by Lord Regent Thorne, who wants to fling her at a rival kingdom’s impregnable wards.

A desperate escape tears open a rift and drags through Borealis Mourne, a shadow-realm warlord leashed for three centuries as a proxy executioner, now bound to her by an ancient blood-vow.

Rather than use the leash, she severs it and frees him, and the two hunted outcasts build a fragile alliance — and then something more — as Thorne escalates from hounds to god-war ordnance to force her surrender.

Together with a mute beast-charmer and a maimed mage, they turn from running to choosing the battlefield, confronting what freedom, agency, and being touched without punishment might actually cost.

Tropes: enemies to lovers, touch-starved hero, only she can touch/hold him, captor-and-captive dynamic subverted (she frees him), morally gray monster hero, forced proximity, fated bond via blood-vow leash (subverted), she’s immune to his power, hurt/comfort, who hurt you, mutual salvation, found family, size difference, healing the broken warrior