Pip, who knew Sal when she was a child, questions the fact that he was the supposed murderer, and believes that the police got the case wrong. Although hesitant at first, Sal Singh's brother, Ravi, agrees to help Pip solve the case if it will help prove that his brother was not the culprit.

Pippa painstakingly interviews multiple friends, family members, and others who are linked to the case of Andie Bell, finding many pieces of crucial evidence that shows that Sal may not be the murderer. After organizing all of her thoughts, evidence, and clues into a file, she uncovers cracks in the timeline of 'events' that occurred on that fateful night. Pip realizes that she is close, maybe too close, to solving the case and finding out what really happened to Andie. Knowing that she has almost exposed the truth, Pip begins to receive threatening notes from an unknown individual telling her to stop digging, threatening her and her family with violence if she continues to search for evidence relating to the case. Pushing aside the aggressive messages and the possibility of danger, Pippa continues her investigation and her dog, Barney is murdered as a result of her not listening to the warnings of the stranger. Pippa's non stop digging causes her to become enemies with many people involved in the case, and she accuses many suspects of being responsible for the murder, with many of her accusations being false.

After conversing with a few of Andie's classmates, Pippa determines that Andie Bell is not the 'perfect kind-hearted girl', that the whole town makes her out to be. Combining the narratives of many individuals who knew of Andie's dark secrets, Pippa finds out that Andie was a ruthless, cruel bully to her friends and peers alike, and to her astonishment, that Andie was selling drugs to her classmates at school. One of her customers, a boy named Max Hastings, one of Sal's best friends, used Andie's drugs, specifically Rohypnol, to drug girls and rape them at big gatherings, infamously nicknamed 'calamity parties'. Also, to her horror, Pip unmasks that Andie was participating in an inappropriate relationship with a teacher, Elliot Ward, the father of Pip's best friend, Cara.

After Pippa's painstaking work and continuous digging, she finds out the truth. Pip makes a visit to Mr. Ward and finds out his perspective of Andie's story, and also that he is holding a girl hostage in his attic, thinking that she was Andie. Pippa then goes to Becca, Andie's sister's house and finds out the whole truth. Becca confesses everything to Pip, including the fact that she was one of the girls who were raped using Andie's drugs. Pippa pieces the truth together and now knows the whole story and proof that Sal Singh did not commit suicide and was not responsible for the death of Andie Bell.

In reality, Andie went to Mr. Ward's house out of the blue. The two of them began to argue, with Andie saying that he is disgusting, and she only pretended to like him to get a college recommendation. The arguing grew more heated, and Andie started to destroy Mr. Ward's important belongings, and he shoved her, causing her to slam her head against his desk, which made her head begin to bleed. Mr. Ward rushes away to get his first aid kit, but when he comes back, Andie is nowhere to be found. Andie, who has a concussion, stumbles her way back to her home. Upon entering her house, Andie is confronted by Becca about her selling drugs. Andie says horrible things to Becca, who pushes her to the floor in outrage. Andie begins to vomit and eventually chokes to death on her own vomit. Panicked, Becca takes Andie's body to an old farmhouse in Andie's car and disposes of her body in a septic tank. After finding out that Andie was missing, and believing that he was the culprit to her disappearance, Mr. Ward kills and frames Sal Singh for the murder of Andie, planting evidence on him. that would prove he was the criminal who killed Andie. Trying to warn Becca to leave the country and make herself a new life, Pippa begins to drink a cup of tea that Becca prepares for her. After a few sips, Pip begins to feel drowsy and realizes she has been drugged. Pippa is almost killed by Becca, but is saved just in time by her family and Ravi. Becca is arrested for murdering her sister.

The book ends on a cheerful note, with Pippa and Ravi beginning a relationship and the case being solved. Pippa makes a speech to many people, and feels content about solving the case of Andie Bell.

In this quote, the author indirectly shows that Pippa is a hardworking character because she says that even her project being disqualified would not stop her from trying to crack the case of Andie Bell, showing that she will not stop at anything and will continue to work hard to help give the case some closure.

In this quote, the author indirectly characterizes Pip as intelligent and hardworking because it says that Pippa has not been sleeping very frequently and has been staying up very late in order to study and do homework, showing that she puts schoolwork as a top priority.

In this quote, the author indirectly characterizes Pippa as intelligent, because she thought about small details that normal people probably wouldn't have thought about. She also thought about both Ravi and herself, showing that he is very perceptive and makes sure that everything she does is done well.