No mystery is too tricky for super-sleuth Cam Jansen and her amazing photographic memory! Cam and her best friend Eric are going door-to-door in their neighborhood, selling chocolate fudge to raise money for the local library. But their sweet fundraiser turns into a serious investigation when Cam notices something very strange: a house that is supposed to be completely empty has a trash can full of garbage outside. Could someone be hiding inside the vacant house? With a quick "click" of her mind, Cam begins to piece together the clues. Now, she and Eric must uncover the truth behind the mysterious house before it's too late. This classic chapter book is perfect for newly independent readers who love following a smart, spunky heroine on a thrilling neighborhood adventure.