New York City journalist Ben Manalowitz is phoned by a stranger, Ty Shaw, that one of his many casual romantic flings, Abilene “Abby” Shaw, has died of an apparent drug overdose. At Ty’s insistence, Ben flies to West Texas to attend the funeral. He meets Abby’s family–brother Ty, mother Sharon, sisters Paris and Kansas City, younger brother Mason (referred to as “El Stupido”), and Granny Carole. Ty informs Ben that he suspects Abby was actually murdered, adamantly maintaining that she never took drugs, and asks Ben to accompany him to find the truth and avenge her. After conferring with his podcast producer Eloise, Ben elects to aid them as part of a story he will produce about grief and denial.

Ben and Ty meet Ty’s friend Crawl, who explains that parties often occur at the oil fields and tells Ben of an area nearby the fields dubbed “the Afterparty”, an area between law enforcement jurisdictions where dead bodies have been reported over time. Crawl and Ty suspect Sancholo, a local drug dealer. Ben meets Quentin Sellers, an eccentric record producer and, like Ben, an outsider who is college-educated but has come to adopt Texas as his home. He gives Ben a memory stick with recordings of Abby performing. Ben confronts Sancholo to discuss Abby’s death, and he reveals he was in Tulsa at the time. After watching a rodeo with the Shaw family, Ben walks to his car which then suddenly explodes. Ben receives a call from Eloise, telling him that the story is complete – and his best ever – and expects him to now return to New York.

More details about Abby are revealed by the Shaws. Granny explains Abby was a drug user, which Ty admits to lying about to get closer to her (supposed) boyfriend. Ben angrily lambasts the Shaw family for living an isolated existence from modern America, as Ty gradually gets angry about Ben’s reluctance to come down and discover how Abby died. An exhausted Ben finally reveals that he and Abby were hooking up and were never a couple, and Ty punches him before walking away. After Sharon suggests Abby’s drug addiction was fed by the distance she felt from people in her life, Ben included, he miserably records his failure to find a compelling outcome and his own self-loathing.

Later that night in Abby’s room, Mason mentions how Abby would speak in code with him, saying “1435” (for the letters in “I love you mucho”). In realization, Ben uses the number to unlock Abby’s phone, finding a contact labeled “Ben”, which Abby did to make her family believe she was texting with a New York boyfriend (thus the Shaws’ misunderstanding). The last few messages indicate that Abby was abandoned by the unknown Texas “Ben” as she lay dying.

Armed with one of Ty’s pistols, Ben rides with Mason to a party at the oil fields. Ben learns that his car was bombed by Texas Tech Red Raiders fans from the rodeo, merely for him chanting for the Texas Longhorns. Ben finds Ty and Quentin, and the latter invites him to a private tent to converse. Inside, Ben notices a stash of opioids and witnesses one of Quentin’s teenage singers being dragged away to “the Afterparty”. After turning off his recorder, Ben elicits a confession from Quentin, who confirms that he caused Abby to overdose and left her to die. Ben reveals that he actually recorded the confession on his phone, to which Quentin responds with a speech about the nature of Ben’s story and how ever-questioning audiences will shift their negative attention from Quentin (who only “left somebody to die” of their own overdose) to Ben and then toward the Shaws. Ben stops the recording and then executes Quentin with Ty’s pistol. Upon returning to the Shaw house, Ben reconciles with Ty and Sharon. Before departing from Texas, Ben remotely deletes all copies of his recordings, electing to keep the story between the Shaws and himself.