14 year old Mabel always looked up to her 17 year old brother Dipper who just like her was a witch. She knew that she didn't have the same powers as him due to the fact she was a white witch. But when the Ciphers, the most famous and powerful demons according to Dipper's journal that Mabel secretly reads, arrive Mabel wants to protect Dipper from the crowned prince of the demons: Bill Cipher.