Grip of the Shadow Plague

A magical preserve faces its gravest threat yet when a mysterious plague begins turning light creatures into shadowy monsters, forcing siblings Seth and Kendra to confront a rapidly spreading darkness that could destroy Fablehaven forever. Seth's early discovery of the infection sets off a desperate race against time as the preserve's defenses crumble and trusted allies become potential traitors. The Sphinx's true allegiance comes into question while imprisoned Vanessa might hold the key to a cure, creating layers of uncertainty in a world where no one can be trusted. This third installment plunges readers into the series' most intense conflict yet, where every decision carries catastrophic consequences.

What sets this fantasy adventure apart is how Mull masterfully escalates the stakes while deepening character relationships and moral complexity. The shadow plague concept introduces genuine horror elements that will thrill readers who enjoy high-stakes magical battles and psychological tension. Fans of Percy Jackson and Artemis Fowl will appreciate how the sibling dynamic evolves under pressure, with Seth and Kendra facing impossible choices that test their courage and loyalty. The relentless pacing and shocking betrayals create an immersive experience that will leave readers breathless until the final page.