Marauding Walls of Doom

All over the world, 8-foot-by-12-foot sections of brick wall appear out of nowhere and zoom along, striking things in their paths. Cars are wrecked, property is damaged, and many people are killed. What is causing this strange phenomenon? Who is behind it? Can the madman be stopped? Maybe Uncle Bert's Preposterous Number Theory can explain some things. If that isn't enough, some people have to contend with mysterious trails of blood, or something that looks like blood, that lead down into their basements. What is at the end of these trails? Should they even look? People try to remember what their mothers said about following mysterious trails of blood into the dark. What did your mother say? And no matter what, no one should answer calls from the Death Number on the T-Ville telephone exchange. Another hilarious Uncle Bert Story from the author of Out of Order Murder Mystery and The Plaid Memorandum.