Just when the members of the secret society begin settling back into ordinary life, a familiar face arrives with a proposition too dangerous—and too tempting—to ignore. The target? The secluded home of the brilliant and enigmatic alchemist Jeronimus Heckyll.

The reward could solve problems they've been unable to escape. But every impossible job comes with hidden risks, and this one may uncover secrets far more valuable than gold. Will they walk away from the life they fought to leave behind? Or will one last heist pull them back into a world of conspiracies, impossible choices, and dangerous discoveries?