An American architect and widower who builds a wing of reconstructed murder scenes at his estate. He suffers from a recurring psychological compulsion to kill his wife, triggered by lilacs and locked doors, which he struggles to suppress until Celia's intervention helps him confront his childhood trauma.
Mark employs Miss Robey to manage household and personal affairs.
Indirect romantic rival through his marriage to Celia.
Former fiancé turned romantic rival after Celia chooses Mark.
Explore the full interactive character relationship map of Secret Beyond the Door