"Unless you put right what you did wrong in your previous life -- and put it right now -- you are going to be horribly and painfully dead before the year's out." Someone at the mysterious Stallery Mansion is pulling the possibilities. At first only small details change -- the color of the mailboxes, the titles of books -- but the changes keep getting bigger and bigger. It's up to Conrad Tesdinic, a twelve-year-old with truly terrible karma, to find the person behind it all. Armed with his camera and a sticky cork that can summon an eerie being called a Walker, Conrad infiltrates the staff at Stallery. And he's not the only one snooping around the mansion. His fellow servant-in-training -- charming, confident Christopher Chant -- is searching for his friend Millie, who's lost in one of the possibilities. Christopher always seems to have a trick up his sleeve. To find the person behind all the mischief and to rescue Millie, the two boys have to work together. Can they keep Conrad's fate from catching up to them?