I'm not Allison

I'm Not Allison is the fourth book of the Double Trouble series.'
==Book Summary==
Santa Mira High's 80's dance is coming up. Kate Foster can't wait to dance with the hot classmate, Jack Wheeler and Kate's twin sister, Allison wants to show off her new sequin dress, but she also wants to go to the dance with Jack. After learning that they want to go to the dance with Jack, the twins fight and Kate ends up slipping and losing her memory.
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