Lo's serious and devoted boyfriend, who works as a foreign correspondent and plays a significant role in the mainland events related to Lo's disappearance.

A self-made billionaire and owner of the luxury cruise ship Aurora Borealis, who is initially portrayed as charming and approachable.

The reclusive wife of Lord Richard Bullmer, who is believed to spend most of her time in Norway and has had a history of serious illness.

A mysterious figure first encountered by Lo borrowing mascara, whose true identity and story aboard the ship gradually unfold.

The manager of hospitality aboard the Aurora, known for her gracious demeanor and overseeing the ship's staff.

A well-known travel journalist and photographer on the cruise, who has personal and professional connections with the ship's guests.

An editor for the Vernean Times, initially perceived as ambitious and ruthless, but later seen as a powerful player in her field.

A journalist and former coworker of Lo's, who offers support in her investigation but has a complicated past with her.

A food critic and travel journalist on the cruise, initially suspicious but ultimately a harmless gossip with insights into the night of the murder.

An ex-model and wife of a financier, who is supportive and empathetic towards Lo during her time on the ship.

A financier and close friend of Bullmer, characterized by his bluntness and minimal involvement in the central events.

An investor on the ship, who keeps to himself and expresses disinterest in financially supporting the cruise.

The head of security aboard the Aurora, who is involved in managing the investigation into the events Lo uncovers.

A Polish cleaning woman responsible for tidying Lo's cabin, who becomes involved unknowingly in Lo's inquiries.

A front cabin steward known for her loyalty to Bullmer and her interactions with the elite guests.

The spa coordinator aboard the Aurora, known for her bubbly personality and efforts to assist Lo.

One of Lo's cabin stewards, who becomes evasive when questioned about activities on the night in question.

A steward serving Lo's cabin, known for his personal involvement with Tina and his limited role in the larger narrative.

Lo's boss at Velocity, whose maternity leave creates the opportunity for Lo's cruise assignment.

A long-time friend of Lo's, mentioned as part of her personal support network.

An investor with a disrupted travel plan, leading to a subplot involving missing passengers.

A kind farmer in Norway, who aids Lo after her escape from the ship and ensures her safe return.