Key to the Universe (Murderous Maths) -- Paperback

For readers scared of squares and perplexed by primes, the next in the unchallenged Murderous Maths series, The Key to the Universe, reveals how they could win a million dollars and become famous. Meanwhile, they must pit their wits against evil Professor Fiendish's Number Chain, and things get ugly when the gangsters meet the unlucky number 13.