Josh arrives home after a long day at work, only to discover that his fiancée Rachel has made a tragic choice on his birthday. While he was at the gym, she succumbed to the darkness, asphyxiating herself with a belt, leaving Josh shattered and consumed by grief.
Fast forward four months, and we find Josh attempting to navigate the tumultuous waters of loss with the help of his friends: Ari, Adam, and Eric. They decide to transform what was meant to be Josh's bachelor party into a restorative getaway at a ranch in Ojai. The first night, Ariel stumbles upon a girl named Jodi, and sparks fly, while Adam grapples with the stark reality that his girlfriend intends to break up with him. Meanwhile, Eric, eager to keep the spirits high, invites his friend Greg over for some camaraderie. As the night unfolds, Jodi ends up crashing at their place after finding herself locked out of her own.
The following morning, the mood quickly shifts when Aaron arrives with his wife and child and is met with a scene that reeks of excess—drugs scattered about and alcohol flowing freely. A heated argument ignites between Eric and Aaron, igniting a debate over Josh's mental state and the chaos surrounding them. In the heat of the moment, Aaron storms off, taking his family with him, leaving the guys to navigate the day with Greg, who reveals the painful truth about Rachel's tragic death to them. As they indulge and get high, Greg's troubled past surfaces, leading to an emotional breakdown that further complicates the weekend.
Later, they return to the bar and encounter Jodi and her cohort of friends. Ari, in a moment of deception, tells Jodi he is married, inadvertently pushing her away. The group slinks back to their place, further dejected, which prompts Eric to call in two strippers in a bid to revitalize the evening's energy. This decision only culminates in heated tensions between Eric and Adam, with Josh and Eric unwittingly becoming aware of a mysterious figure watching them from the shadows—a man whose motives remain unclear.
The next day's festivities take an even darker turn. Eric invites a bevy of prostitutes, hoping to recreate the wild escapades from the night before. However, their revelry is cut short by an unexpected visit from Rachel's parents, who crash into their party with a heavy weight of accusation. They demand answers regarding the circumstances surrounding Rachel's demise, asserting that Josh must be veiling his guilt with an alliance to the authorities. They present Josh with photographs depicting him with the stripper from the previous night, revealing that the so-called stalker was nothing more than an operative sent to spy on them. Adding to the grave nature of their visit, the parents disclose that a second autopsy report cast doubt on the initial determination of suicide.
In an emotionally charged moment, Josh erupts in frustration, tearing apart the bag Rachel's parents brought, only to unveil a hidden wire—an unsettling indicator that they were on a quest to extract a confession from him regarding their daughter's murder. After compelling them to leave, he seeks solace among his friends. Deeply affected, Josh finds comfort in their supportive words, leading the group to engage in the board game that Adam had long envisioned playing together since their arrival.
As the weekend approaches its conclusion, the friends immerse themselves in this "exceedingly complex board game" with Jodi, who returns to join them. After the game, as she prepares to leave, Ari walks her to the door and shares an impulsive kiss. However, when Jodi comes to the abrupt realization of Ari's marital status, she hastily ends the moment. The story culminates with the group exchanging heartfelt goodbyes and pledging to reunite soon. Josh and Ari linger momentarily, with Josh teetering on the edge of expressing something significant, yet faltering as Ari drives away into the distance, leaving a poignant silence hanging in the air.
