Character Relationship Map: Last Sentinel

Characters

• Cassidy (played by Kate Bosworth) — protagonist

  Cassidy is a corporal stationed at Sentinel and secretly involved with Sullivan. She later rejects his claim of love, reveals that she is a traitor, and admits to killing the relief crew. Despite this...

• Sullivan (played by Lucien Laviscount) — protagonist

  Sullivan is Sentinel's fisherman and cook, who investigates the drifting ship, repairs it with Baines, and challenges Hendrichs's increasingly rigid decisions. His secret relationship with Cassidy col...

• Baines (played by Martin McCann) — supporting

  Baines is Sentinel's mechanic and Sullivan's uneasy ally. He secretly repairs the drifting ship and helps plan an escape, then leads a mutiny after Sullivan destroys it to save him. His instability cu...

• Hendrichs (played by Thomas Kretschmann) — supporting

  Hendrichs is the sergeant and squad leader responsible for defending Sentinel. He repeatedly favors military caution, nearly fires the doomsday weapon at the drifting ship, and orders Baines and Sulli...

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Sullivan → Cassidy (Romantic Secret Lovers) — Their hidden sexual relationship strongly affects Sullivan's decisions.

  The plot states that Sullivan and Cassidy are in a secret relationship and have sex after Sullivan returns from the ship.

• Hendrichs → Baines (Professional Commander And Subordinate) — Hendrichs exercises formal authority over Baines.

  Baines serves on Hendrichs' crew, and Hendrichs orders him and Sullivan to sink the repaired ship.

• Hendrichs → Sullivan (Professional Commander And Subordinate) — Hendrichs repeatedly issues operational orders to Sullivan.

  Hendrichs sends Sullivan to investigate the unidentified ship and later orders him to sink it.

• Hendrichs → Cassidy (Professional Squad Leader And Subordinate) — Hendrichs commands Cassidy as part of the Sentinel crew.

  Hendrichs is the squad leader, while Cassidy is a corporal serving under the command structure at Sentinel.

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Baines → Cassidy (Alliance Mutiny Allies) — They cooperate after rejecting Hendrichs' command.

  Cassidy joins Baines' mutiny after Sullivan destroys the ship, and the two later leave Sentinel together to salvage it.

• Sullivan → Baines (Alliance Teammates) — They cooperate against Hendrichs' restrictive orders.

  Sullivan and Baines serve together at Sentinel, repair the adrift ship, and plan to use it to leave the outpost.

Story Analysis

Four isolated crew members confront failing authority, suspected treason, and the moral burden of a weapon that could determine the future of both continents.

Plot Progression

1. The Empty Horizon — The surviving crew maintains Sentinel while relief remains overdue. Storm damage and deteriorating conditions expose tensions between the four members.
2. The Silent Vessel — An unidentified ship appears and creates fears of invasion. Sullivan's investigation prevents an immediate catastrophe, but the ship introduces new uncertainty.
3. A War Without Echoes — The crew questions whether the distant war still exists after command echoes their own message. Baines and Sullivan secretly repair the ship and imagine escape.
4. Mutiny Under Threat — Hendrichs orders the ship destroyed, and the crew's dispute becomes a mutiny after Sullivan fires on the returning vessel. Baines then threatens the doomsday weapon during a breakdown.
5. Truth at Sentinel — Hendrichs disappears, Baines is reported dead, and Sullivan investigates Cassidy. Her confession and the useless weapon force them to choose a shared defensive purpose.