The fate of the mythical world hangs in the balance – and Ambrose Davids may be the only one who can save it.

When a deadly creature escapes the Repository and begins stalking the streets of London, Ambrose is strangely hesitant to act. But when a friend's life is threatened, he's forced back into the world he thought he'd left behind to hunt down the beast before time runs out.

One mission leads to another, and soon Ambrose is facing more than just mythical monsters. With his sister missing and his past catching up to him, he sets out on a desperate journey across Europe – one that leads him to the elusive and dangerous Twilight Market, a place where myths are traded like coin and nothing comes without a cost.

Can Ambrose reclaim what was stolen before it's too late?

Meanwhile, deep inside the Repository, newly appointed Keeper of Exotic Animals James Davids is discovering that power comes with a price. Forced to collaborate with a ruthless researcher, James finds himself overseeing experiments that promise profit at the cost of the creatures' wellbeing.

As pressure mounts from the Council and the creatures grow restless, James must decide whether he'll be a protector... or a pawn.