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As her studies at the coolest Cornish college continue, Kara Winter is finally enjoying her freedom. She has reliable friends and a boy she really likes by her side. He invites Kara to his birthday party... Unbelievably, there's a real party and a sleepover in London ahead... without adults! It seems that no one can spoil the main character's mood - except for a strange piece of paper and the girl's excessive curiosity. If only she didn't have to pay for it! All hope is for a contact person who lives nearby and will come to the rescue in case of danger. But the danger is approaching, and the contact person has disappeared. And this new student is always following Kara... Who can the girl trust?