In this sequel to the bestselling, “pulse-pounding” (Publishers Weekly) A Door in the Dark, Ren's intellect and cunning are stretched to the limit in her quest to take down the system that stole her father's life.

Ren Monroe is a wolf among lions. After infiltrating one of the greatest Houses in Kathor through her successful bond with Theo Brood, she finds Theo's father is two steps ahead. He exiles Theo and isolates Ren, strategically working to break her unwelcome grasp on his son—and foiling Ren's first step to enacting the revenge she's been planning her whole life.

Ren might have more resources than she'd ever imagined growing up, but she'll still get nowhere without allies. Enter House Tin'Vori. Years ago, House Brood led an unprecedented raid to destroy a fellow House of Kathor. But a few siblings survived, and they haven't forgotten the horrors waged against their family. Quietly, they've plotted their own revenge, waiting for the right moment to strike. And Ren Monroe might be their best chance.

Like fire, the Tin'Vori siblings are as dangerous as they are useful, both gifted in rare magics. Ren must decide how to unleash them against House Brood without hurting Theo in the process. Her feelings for Theo are growing past the boundaries of their bond, and Ren finds herself balanced on a knife's edge, a breath away from immense power or utter ruin.

Ren Monroe has spent four years proving she's one of the best wizards in her generation. But top marks at Balmerick University will mean nothing if she fails to get recruited into one of the major houses. Enter Theo Brood. If being rich were a sin, he'd already be halfway to hell. After a failed and disastrous party trick, fate has the two of them crossing paths at the public waxway portal the day before holidays; Theo's punishment is to travel home with the scholarship kids—which doesn't sit well with any of them.

A fight breaks out. In the chaos, the portal spell malfunctions. All six students are snatched from the safety of the school's campus and set down in the middle of nowhere. And one of them is dead on arrival.

If anyone can get them through the punishing wilderness with limited magical reserves it's Ren. She's been in survival mode her entire life. But no magic could prepare her for the tangled secrets the rest of the group is harboring, or for what's following them through the dark woods…