The "Murderous Maths" 5 Book Bundle by Kjartan Poskitt is a series of non-fiction books aimed at children aged 9-12. Published by Scholastic, the books focus on mathematics and sciences in an entertaining and engaging way. With captivating narratives and illustrations, these paperbacks are sure to inspire young readers to explore the interests in these subjects. The bundle offers a collection of books that will keep children entertained and educated throughout the 2000s era.