The Read-a-Thon is on! The kids at Sleepy Hollow Elementary are having an all-night reading marathon. Their goal is to read more books than any other school and earn a brand-new computer. But when the kids read about a treasure hidden in their own school basement, the Read-a-Thon turns into a treasure hunt. Cassidy wants the treasure and the computer, but one thing stands in her way: Nighttime is ghost time! And there's a whole lot of haunting going on. Readers beware!