13 Minutes by Sarah Pinborough

After surviving 13 minutes of clinical death in a freezing river with no memory of how she got there, popular teenager Natasha Howland teams up with her former best friend to uncover which of her current friends tried to murder her. 

This book contains: alcohol/abuse, animal cruelty, anxiety, bullying, body shaming, death/grief, drugs/drugging, dubious consent, explicit sexual activities/nudity,  lying, murder, parental neglect, pedophilia, pervasively vulgar content, profanity,  smoking, statutory rape, toxic relationships, trauma and violence.