Murderous Maths Collection 10 Books Set. Titles in the Set The Phantom X, Desperate Measures, The Perfect Sausage and Other Fundamental Formulas, Guaranteed to Bend your Brain, Do you Feel Lucky, Awesome Arithmetricks, Savage Shapes, Guaranteed to Mash your Mind, The Key to the Universe, Easy Questions Evil Answers. Murderous Maths set by Kjartan Poskitt. Guaranteed to smash your mind features maths with the laughs added in, along with tricks, tips & short-cuts.