In this final installment in the "Gem of the Deep" series, set in the world of "Forgotten Lore," the magical machinations of Zealla Alcuri and her criminal sponsor have unleashed an ancient eldritch horror upon Li Syval. As the city is consumed by violence, Aris, Nails, Ferret, and their new allies must find a way to unlock Ferret's latent magical powers and confront the sorceress before it is too late to save the stricken city from total destruction.