Lately Claudia's been wishing she could clone herself.  She just can't be everywhere she needs to be - doing her schoolwork, keeping up with the BSC, hanging out with her seventh-grade friends, and seeing her new boyfriend, Josh.  If she could bring some of those people closer together, her life would be a lot easier.  A party might help, but her parents probably won't let her have one.  
But wait!  Her parents are going away for four days.  Claudia convinces her sister that a quiet little gathering of friends will be okay.  But unfortunately for Claudia, the party isn't quiet or little - and it's definitely not okay.  Uh-oh.