Plot

February 12 is just another day in Sam's charmed life, until it turns out to be her last. Stuck reliving her last day over and over, Sam untangles the mystery around her death and discovers everything she's losing.

What if you had only one day to change absolutely everything? Samantha Kingston has it all: the perfect friends, the perfect guy, and a seemingly perfect future. Then, everything changes. After one fateful night, Sam wakes up with no future at all. Trapped reliving the same day over and over she begins to question just how perfect her life really was. And as she begins to untangle the mystery of a life suddenly derailed, she must also unwind the secrets of the people closest to her, and discover the power of a single day to make a difference, not just in her own life, but in the lives of those around her - before she runs out of time for good.

Samantha Kingston lived a perfect life. Great friends, great boyfriend, and great family. And then one day everything changes. She has to relive the day of her death over and over again. Sam must confront friends, do what's right, and say her final goodbyes.—Emma Villanueva

Samantha Kingston has it all: looks, popularity, perfect boyfriend and perfect friends. Friday, February 12 should just be another day for Sam. Instead, it's her last. Sam wakes up the next morning, thinking it is Saturday, but soon wakes up on the same day for seven days during a miraculous week. She untangles the mystery surrounding her death. She may also effect others life while she goes through a mystery of not only her own death, but others.—Lizzie

Samantha Kingston wakes on February 12, known as Cupid's Day. She is picked up by her friends, Lindsay, Ally and Elody, who joke with her about losing her virginity to her boyfriend Rob that night. During class, when her teacher is lecturing on Sisyphus, Sam is handed a rose, gifted from her boyfriend with a nonchalant note. She is also given a pale colored rose with a note suggesting it is from another boy named Kent. He later invites her to his party. During lunch the girls make fun of Juliet, an outsider girl that they view as a "psycho". At the party, Juliet shows up, seemingly uninvited. Lindsay confronts her and the two fight, with Juliet leaving in tears. As they are driving back from the party, the car hits something and crashes, apparently killing Sam..

Samantha Kingston wakes on at 6:50 am on February 12, known as Cupid's Day. She is picked up by her friends, queen bee Lindsay Edgecombe, Ally Harris and Elody, who are excited about Sam's plans to lose her virginity to her boyfriend Rob Cokran that night. During a class lecture on Sisyphus, students distribute roses, with Sam getting one from Rob and another from a boy named Kent McFuller, a former grade school friend who is in love with her. Kent invites her to a party at his house, but she's unenthusiastic. During lunch the girls make fun of Juliet Sykes, an outsider girl who they view as a "psycho". At the party, Juliet shows up. Lindsay confronts her and the two fight, resulting in many of the guests dousing her with beer. Humiliated, Juliet leaves in tears. As Sam and her friends are driving back from the party, the car hits something and crashes, apparently killing them.

Sam wakes in her room on Cupid's Day again. Thinking the previous day was just a nightmare, Sam continues on with her day but finds that the same events occur, and they again crash after leaving the party. Sam wakes up on the same day again. Realizing she's in a time loop, she convinces the group to have a sleepover at Ally's instead of going to the party. They avoid the crash, but find out later in the night that Juliet committed suicide, with Sam also discovering that Lindsay and Juliet were once best friends. Even though Sam manages to avoid the crash, she continues to live through the same day over and over again.

Realizing that nothing she does matters, she starts doing whatever she wants, first airing her grievances with everyone she knows, then trying to spend more quality time with the ones she loves. During these loops, she attempts to make amends with Anna Cartullo, a student she had bullied and becomes closer to Kent. After an unsatisfying first sexual experience with Rob, Sam is comforted by Kent and remembers their earlier friendship.

In another loop, Sam and Kent share a kiss at the party, with Kent recalling how she had heroically defended him from a bully after his father died and that he had resolved to one day be her hero. She hears the fight between Lindsay and Juliet from the hall and chases after her through the woods. Sam tries to apologize and learns from Juliet that Lindsay's misery from her parents' fighting and divorce caused her to develop Nocturnal enuresis. When the two were on a camping trip and Lindsay wet her sleeping bag, she blamed Juliet and had been bullying her ever since. Juliet commits suicide by running in front of Lindsay's car, horrifying Sam, and making her realize that it was Juliet who was hit by the car on the original day. Sam wakes up again with a sense of calm and understanding, knowing what she must do to end the loop. She resolves to be kind and considerate as she goes about her day. She sends roses to both Juliet and Kent, breaks up with Rob and tells her friends why she loves them. At the party, she kisses Kent and tells him she loves him. She again intervenes to save Juliet, but when Juliet attempts to run into traffic, Sam pushes her out of the way at the last second and is killed by a truck. As she dies, Sam remembers all the good times she has had. Sam's spirit sees Juliet standing over her body saying that Sam saved her; Sam states, "No. You saved me."