Part-one of a super two-part diary series featuring Mary-Kate and Ashley. School's out and the girls are at summer camp - but with these two, it's never plain sailing! Mary-Kate and Ashley are at summer camp, where their team has to beat a rival camp's team in a secret competition. It's hard to say what their biggest problem is - is it that Mary-Kate has a crush on her tennis partner, Andrew, while his dad (the tennis coach) has forbidden him to see her? Or that Ashley's little buddy, Jessie, keeps following her around and spilling everyone's secrets? And there are plenty of secrets to spill...