Claire is Amber's friend from elementary school, with whom she shares a deep bond and communicates in unique ways. Her character often emerges in contrast to Amber's perceptions, raising questions about the nature of their friendship.

Paul is Amber's husband, a novelist working on his second novel, who becomes a central figure as Amber suspects his involvement in her accident. His love and commitment to Amber are evident, despite the tensions in their relationship.

Edward is described within Amber's narrative as her ex-boyfriend and current stalker who works at the same hospital where she is recovering. His presence is a source of tension and concern within the story.