Hannah's wealthy and glamorous suitemate at Oxford, known for her confident demeanor and complex friendship with Hannah, which is central to the novel's events.

Hannah's college crush and later husband, who shares a complicated history with both Hannah and April, influencing much of the story's personal dynamics.

A member of the friend group at Oxford who maintains a low profile and whose family has high expectations for him academically and professionally.

Part of Hannah's friend group, sharing a similar socioeconomic background to her, and dealing with complex feelings about class differences at Oxford.

A witty and confident mathematician who is supportive of Hannah, playing a critical role in their friend group dynamics.

Hannah's academic advisor at Oxford who has a significant impact on her academic journey and personal growth.

A reporter with a distinct perspective on the high-profile case who believes in uncovering the truth, offering new insights into the story's central mystery.

A porter at Pelham College whose interactions with Hannah are pivotal to the unfolding events at Oxford.

April's sister and a social media influencer who becomes involved in revisiting past events and analyzing new evidence with Hannah.