Linn desperately needs a best friend, it's clear to see. But alone, she has no chance against the girls' clique at her school, who have made her their favourite victim. When Shark, aka Sophie Hyazinth Amanda Ricarda Kornelius, moves into the flat beneath hers, Linn's dream seems to come true. The new girl looks cool in her bright leggings and is never short of a cheeky quip. She doesn't upset anyone! But how can Linn get Shark to notice her? She, who can't even bring herself to share her secret hobby? Then Linn finds out that Shark has a big secret, too. Maybe they can be friends after all?