Carver Briggs never imagined the text he sent would lead to a deadly accident. Reeling from the deaths of his three friends and riddled with guilt, Carver finds himself shunned at school and facing a possible criminal investigation. When the grandmother of one of the boys who died invites Carver to spend a "goodbye day" with her and other friends, sharing memories and engaging in an activity the boy loved, Carver finds a measure of peace. When the other families make the same request, Carver is forced to face his pain head-on.