Jet returns to her house with Billy and finds only Reggie home. The two move silently through the rooms and out to the covered pool, both weighed down by the violence that has happened there and by the memory of Emily’s death.

At the pool, Jet asks Billy to tell her everything he remembers from the day Emily drowned. Billy recounts playing soccer with Luke while Billy’s mother gardened and Billy’s father prepared for a barbecue. Billy remembers Luke’s arms being covered in scratches and, with new doubt sparked by what Jet and Billy found in Emily’s messages, Billy admits he suspects Luke may have already been scratched before going into the bushes to retrieve the ball.

Billy continues: Luke said he had been inside all day playing PlayStation, but Billy now thinks Luke smelled like chlorine during the soccer game. Billy describes how his mother walked Luke back to the Mason house because Luke had forgotten a key, how the side door was open, and how Billy’s mother was the first to notice Emily’s body at the bottom of the pool. Billy’s father dove in, found Emily’s hair caught in the drain, and eventually cut her free with scissors Luke retrieved; CPR failed and the ambulance arrived shortly before Jet came home with her parents.

Jet presses Billy on whether his mother ever mentioned what Emily wanted to tell her. Since Beth Finney is gone, Jet asks to search for any old school diaries or calendars Beth might have kept. Billy brings Jet to his house and up to the attic, where he has preserved boxes of Beth’s belongings despite his father wanting to throw them out.

In the attic, Jet notices missing photos in Beth’s album, suggesting Beth took some “important” memories when she left. Billy locates Beth’s 2008 planner and checks Friday May 30 for any note about Emily but finds none—until he turns to Saturday May 31, the day Emily died. In small, panicked writing, Beth recorded: “He was already wet. Before.” The note corroborates Billy’s faint memory that Luke smelled like chlorine earlier, implying Luke had been in the pool before Emily was found and before he jumped in during the rescue. Jet and Billy are shaken as they consider the unthinkable possibility that Luke killed Emily, and Jet realizes that if Emily’s death wasn’t an accident, then the guilt Jet carried may never have been hers to bear.