Character Relationship Map: The Postcard Killings

Characters

• Jacob Kanon (played by Jeffrey Dean Morgan) — protagonist

  New York detective and grieving father who leads the cross-continental investigation into a serial killer targeting honeymoon couples.

• Valerie Kanon (played by Famke Janssen) — protagonist

  Jacob Kanon's daughter and a murder victim whose death on her honeymoon in London triggers the entire investigation.

• Dessie Lombard (played by Cush Jumbo) — supporting

  American journalist based in Sweden who assists Kanon with research and provides crucial insights into the killer's pattern.

• Pieter Holl (played by Dylan Devonald Smith) — supporting

  A suspect or associate connected to the killer's network, involved in the cross-border criminal operations.

• Simon Haysmith / Mac Randolph (played by Ruairí O'Connor) — supporting

  An alias used by the serial killer to infiltrate and target honeymoon couples across Europe.

• Marina Haysmith / Sylvia Randolph (played by Naomi Battrick) — supporting

  Another alias used by the serial killer to blend in and target couples during their travels.

• Nienke Holl (played by Sallie Harmsen) — minor

  Relative or associate of Pieter Holl, possibly providing clues or suspecting foul play.

Canonical Relationships

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

• Pieter Holl → Nienke Holl (Family Married Couple) — Their marriage places them among the couples encountered in the killers' cross-border pattern; both are subsequently found dead.

  The plot identifies Pieter Holl and his wife, Nienke Holl, and says they are later found murdered.

• Simon Haysmith / Mac Randolph → Marina Haysmith / Sylvia Randolph (Romantic Criminal Partners) — The pair commit the murders together and frame their crimes as a response to a world that rejects their love.

  The suspects' identities connect Simon Haysmith and Marina Haysmith / Sylvia Randolph to the killings. They discuss their shared desire to make Jacob...

• Jacob Kanon → Valerie Kanon (Family Father And Daughter) — Jacob's grief over Valerie's murder drives him to pursue the killers beyond the limits of the official investigation.

  Valerie is identified as Jacob's daughter. Her murder in London triggers his investigation.

Story Dynamics

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

• Marina Haysmith / Sylvia Randolph → Nienke Holl (Conflict Suspect Connected To Victim) — The sighting connects Marina, using the Sylvia identity, to Nienke shortly before Nienke's murder.

  The traveling couple identified as Mac and Sylvia had met Pieter and Nienke Holl; surveillance places the couple with them on a ferry shortly before t...

• Simon Haysmith / Mac Randolph → Pieter Holl (Conflict Suspect Connected To Victim) — The ferry sighting links Simon, using the Mac identity, to Pieter shortly before Pieter's murder.

  Mac and Sylvia had met Pieter Holl, and surveillance places them with Pieter on a ferry shortly before he and Nienke are found murdered.

• Jacob Kanon → Marina Haysmith / Sylvia Randolph (Conflict Detective And Suspect) — Jacob's investigation leads toward Marina, one of the suspects linked to the staged killings and the effort to evade authorities.

  Jacob grows suspicious of the traveling couple, whose identities connect to Marina Haysmith / Sylvia Randolph and the murders.

• Jacob Kanon → Simon Haysmith / Mac Randolph (Conflict Detective And Suspect) — Jacob pursues Simon as one of the suspected killers, while the killers discuss making Jacob suffer.

  Jacob suspects the traveling couple are lying about leaving the ferry because Mac felt ill, and later warns police that the suspects are escaping.

• Jacob Kanon → Dessie Lombard (Alliance Investigative Allies) — Dessie contributes reporting and insight to the investigation, while considering an account of Jacob's loss; he refuses to become the subject of her story.

  Dessie, a journalist targeted by the killer, becomes part of the inquiry and assists Jacob with research.

Story Analysis

A grieving father pursues killers whose staged murders turn love and art into a justification for violence, while the investigation's final outcome remains unrevealed.

Plot Progression

1. A Daughter's Murder — Valerie's murder in London devastates Jacob, who refuses to accept the limits of the investigation. Postcards and similar crimes across Europe begin to reveal a wider pattern.
2. Suspicion on the Ferry — Dessie joins the inquiry as Jacob encounters the traveling couple in Stockholm. Their connection to the Holls and the ferry surveillance intensify suspicion, especially after Pieter and Nienke are fou...
3. False Trails and Identities — The discovery of another murdered couple and receipts used to manufacture alibis exposes the care behind the deception. The suspects' identities connect to Simon and Marina Haysmith and their aliases.
4. Justice Without Closure — Jacob warns that the suspects are escaping, but they have already gone. The account turns to Jacob's grief and persistence as Dessie considers how to present his pursuit of justice; the final outcome...