Spontaneous

In a shocking turn of events during a senior calculus class at Covington High, student Katelyn Ogden unexpectedly explodes, leaving classmates and the entire classroom covered in gore. This catastrophic incident prompts an immediate police investigation, focusing on the cause of this mysterious explosion.

With Katelyn's death as a central concern, law enforcement takes the entire calculus class into custody for questioning. While they rule out an attack, the true cause behind Katelyn's explosion remains a mystery, intensifying fear among the students.

Amidst the chaos, Mara Carlyle expresses her deep concern that another explosion could occur, a notion that resonates with her classmates. This growing anxiety highlights the pervasive feelings of fear and uncertainty that envelop the school.

While navigating her emotional turmoil, Mara receives an anonymous text message from someone who claims to have harbored feelings for her for years. The message takes a bizarre turn when the sender responds with an unusual image of Richard Nixon, adding confusion to Mara's already strained state of mind.

After attending Katelyn's funeral, Mara finds solace in the numbness offered by mushrooms obtained from school dealers. Sharing a calming tea with her friend Tess, Mara indulges in a momentary escape from the grief and fears plaguing their lives.

During a vulnerable moment, fellow student Dylan Hoevmeyer reveals to Mara that he is the anonymous admirer that had been texting her. He shares his reflections on life’s fragility, expressing his worries about the potential for further explosions, and motivating him to take action.

As their romantic relationship blossoms, Mara and Dylan attend a school football game followed by a house party. However, the night takes a horrifying turn when classmates Perry Love and Cranberry Bollinger explode, triggering widespread panic and chaos among attendees.

In the aftermath of the explosions, various government agencies become involved, leading to the assignment of FBI Agent Carla Rosetti. She enlists Mara and Tess to help investigate possible drug connections to the horrifying incidents occurring at the school.

Mara decides to take a ride with the Dalton twins, the school dealers, but the outing takes a disastrous turn when the car unexpectedly explodes. Dylan arrives to support Mara amidst the chaos, but federal agents soon detain them both as part of a larger investigation.

As investigations continue, the government begins developing a so-called 'Snooze Button' pill that is said to cure the students of their fears and prevent further explosions. This effort is met with skepticism as the number of explosions increases, and students are subjected to experimental medications.

In defiance of their grim reality, Mara and Dylan choose to live life to the fullest, indulging in intimate moments and dancing to nostalgic 80s music in a barn. This hedonistic lifestyle reflects their desire to seize the present while grappling with the fear of impending disaster.

As classes resume, residents of Covington grow increasingly fearful of the students, leading to a tense atmosphere around the school. During a heartfelt conversation, Agent Rosetti inadvertently warns Mara that more explosions might happen, deepening her concerns.

During a school seminar intended to showcase the effectiveness of the Snooze Button pill, tragedy strikes as another student unexpectedly explodes. This sets off a chain reaction of explosions, creating chaos and terror throughout the classroom, leaving students terrified for their lives.

In the midst of escaping the mayhem, Mara and Dylan are separated. While Mara manages to exit to safety, she tragically witnesses Dylan explode right before her eyes, leaving her injured and devastated by the traumatic loss.

At the combined graduation and prom ceremony, Mara confronts her feelings of guilt and regret, offering a casual apology to attendees. After reconciling with her friend Tess, who invites her to join her at the beach house, Mara finds a path to healing by visiting Dylan's grave and speaking with his mother, encouraging her to move forward.

In the aftermath of the explosions, the authorities shut down Covington High, marking it for demolition as 31 students have lost their lives. Mara, now determined to embrace life, prepares to move into the beach house with Tess, supported by her parents, and reflects on the importance of cherishing every moment.