When Holly and Ivy receive an invitation to their Aunt Margaret Lowe’s memorial service and the reading of her will, they’re surprised to see their estranged sister Fern’s name on the invitation list. Excited to re-unite with Fern, Ivy insists they attend. Holly has mixed feelings about the impending reunion. Complicating matters, a unique provision in their aunt’s will requires the inheritors to participate in a treasure hunt to receive their inheritance. Sounds like fun, until they discover a dead body in the library of the Lowe mansion. The Donnelly sisters’ sleuthing skills are put to the test when they must solve the treasure hunt riddles and catch a cold-blooded killer.