The Brain doesn't believe in superstition like Arthur and the rest of their friends. But when he tries to prove that superstitions are nonsense, the Brain soon finds bad luck everywhere. The big softball game is on Friday, the 13th — and now the Brain plans to stay home. But his friends need him. Will the Brain be able to shake off his bad luck and help his team to victory? Presented in chapter-book format, for children who are ready to read on their own, this tale of mishaps will surely be a hit among Arthur fans.