"The Haunted Library" opens with teen detective Ruby Skye hot on the trail of whoever--or whatever--is making those scary noises late at night in the spooky old O'Deary Library. Before she makes much progress on the case, Ava O'Deary, the library's puzzle-loving owner, dies without leaving a will, which means that Ava's nearest living relative, Lillian O'Shyte, will inherit everything. And she plans to bulldoze the library and replace it with an adults-only condo tower. Ruby vows to save the library. But how?