For weeks, viewers have focused on Dr. Laurence Markham’s unsettling behavior, his mysterious obsession with Diane, and the possibility that he is connected to the Laurent family. But the most important clue may have been sitting quietly on a bookshelf the entire time. It was not a hidden photograph, a confidential file, or a secret recording. It was a signed book. When Diane recognized Dr. Alan Laurent’s signed copies inside Markham’s collection, the moment transformed an ordinary prop into what could become one of the strongest identity clues the show has presented. If this detail was placed intentionally, then Markham’s biggest secret may already be hiding in plain sight.
The most striking part of the scene is that Diane did not simply notice a familiar medical book. She specifically recognized Alan Laurent’s works and immediately realized that several copies carried Alan’s signature. That distinction matters. Anyone can purchase a published book. A signed copy, however, usually suggests a personal relationship between the author and the owner. More importantly, Diane herself treated this discovery as suspicious. She was not making a random observation. She used the books to argue that Markham’s connection to the Laurent family could not be dismissed as coincidence. In other words, the show itself encouraged the audience to take the bookshelf seriously.
That single detail completely changes the conversation. Without the signatures, Markham could simply be another psychiatrist who admired Alan’s work. Medical professionals often collect books written by respected colleagues. But signed copies create a very different implication. They suggest direct contact, professional collaboration, or even friendship. Suddenly the bookshelf is no longer a decoration. It becomes physical evidence that Markham’s relationship with Alan was much closer than anyone previously assumed.
This is exactly where one of the most talked-about online theories gains momentum. A discussion started by Reddit user u/Pips-705 originally focused on something much more subtle: Markham’s voice occasionally sounded similar to Martin Laurent’s. At first, that observation could easily be dismissed as subjective. Voices can resemble one another, and viewers often notice patterns that are never intended. However, once the bookshelf entered the equation, the theory evolved. Instead of relying only on impressions, it gained a tangible clue that exists on screen. Additional comments from users including u/usabn and u/SnorkinOrkin pushed the conversation even further by questioning why Markham would possess multiple signed books connected to Alan if there were no deeper story behind them.
Perhaps the biggest clue is not even the books themselves but how the scene was filmed. The camera did not rush past the bookshelf. Diane was given time to examine the collection, and the audience was encouraged to notice exactly what she was seeing. Television dramas rarely devote valuable screen time to meaningless objects, especially during mystery-driven storylines. If the writers only wanted to establish that Markham was a respected psychiatrist, a single line of dialogue could have accomplished that. Instead, they deliberately showed the books, allowed Diane to react to them, and used those books to advance her suspicions. That is exactly how an important prop is typically introduced before becoming relevant later.
The theory also exposes a significant historical gap in the story. If Dr. Laurence Markham is simply a completely unrelated psychiatrist, several questions remain unanswered. Why does he own an extensive collection of Alan Laurent’s books? Why are signed copies among that collection? Why is there evidence suggesting a professional connection between Markham and Alan? Most importantly, why does Diane immediately connect those books to Martin Laurent rather than dismissing them as ordinary medical references? At the moment, the series has offered no on-screen explanation that ties all of these details together if Markham is merely another doctor.
Of course, the opposite theory creates its own challenges. If Markham is actually Martin Laurent living under another identity, the show would still need to explain several major inconsistencies. His appearance is different. His professional identity would require a believable backstory. His medical credentials would have to withstand scrutiny, and anyone who knew Martin in the past should eventually recognize him. Solving one mystery would immediately create several new ones. That is why the identity theory remains exactly that—a theory, not a confirmed plot twist.
There is also a third possibility that deserves consideration. Markham may not be Martin at all, but he could be one of the few people who knows the truth about Martin’s fate. In that scenario, the signed books would still carry enormous significance. Instead of revealing that Markham is secretly Martin, they would establish that his relationship with Alan and the Laurent family was far deeper than anyone realized. That alone would explain why Diane viewed the collection as far more than an innocent coincidence.
Whether the writers ultimately reveal Markham as Martin, an old colleague, or simply the keeper of a dangerous secret, one fact is becoming increasingly difficult to ignore. The bookshelf is no longer just background scenery. Diane’s reaction transformed it into evidence, and the signed copies transformed it into a potential key to the entire mystery. Sometimes the biggest twist is not hidden inside a dramatic confession or a shocking DNA test. Sometimes it is sitting quietly on a shelf, waiting for someone to recognize a single signature that changes everything.
