The next book in the thrilling, chilling New York Times bestselling series!

With no way into the McMartin house's magical paintings, and its three guardian cats reluctant to help, Olive's friend Morton is still trapped inside Elsewhere. So when Rutherford, the new oddball kid next door mentions a grimoire--a spellbook--Olive sees a glint of hope. If she can find the McMartins' spellbook, maybe she can help Morton escape Elsewhere for good. Unless, that is, the book finds Olive first. The house isn't the only one keeping secrets anymore . . .