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Sandra is for the 'Gang', Sasha is for mom, Alexandra is at college. She is almost seventeen, and from the outside, it seems her life is wonderful: she dyes her hair green like a mermaid, plays in a punk band,... and is dating a guy. But only Sandra has enough problems and worries: mom is against her communication with her sister, the college wants to expel her, and her boyfriend is increasingly keeping secrets. The only people who accept Sandra are the 'Gang' she plays with. Soon there will be a music contest, the victory of which could change the girl's life and that of the whole group. Will she have enough courage to seize the chance, and what to do if one small lie for the good leads to catastrophic consequences?  The author of the book, Elena Boroda, is a writer, philologist, literary critic. She is a laureate of the International Prize named after V. P. Krapivin and a finalist of the 'Kniguru' prize.