Sean Robertson is an ancillary character in the rough draft version of the novel Nocturnal by author Scott Sigler. The character is initially introduced in episode 4 of the audio version of Nocturnal.
Sean Robertson is the Sub Chief of Police for the San Francisco Police Department. In episode 4, he is in attendance at the debriefing of SFPD Homicide Detectives "Pookie" Chang and Bryan Clauser on "Piss Man" cases, along with Chief Amy Zou. He and Chief Zou seem to share some little-known understanding about these symbols as they consider taking Pookie and Bryan off the cases, however it is not disclosed what the connection is.
In episode 4, Robertson receives an email that confirms the symbols from the murder scenes were searched via the FBI's Symbols Analysis Database (SAD). After calling John "The Black Mr. Burns" Smith and confirming that it was Pookie who made the inquiry, Robertson makes a call from his cell phone to an unidentified person to tip them off about the research being done on the symbols.
The author refers to this character with only the full name of Sean Robertson, there are no known nicknames.
Sub Chief Robertson is described as being in his early forties wearing trendy narrow black glasses. He is also described as being stoic, rarely looking mad or happy, and being “everyone’s worst nightmare at the poker table.”
From the minimal information given about Sub Chief Robertson, he appears to be a no-nonsense type of person. He also seems to be a good judge of character as he is proven correct in his assessment of "Pookie" and Bryan’s tenaciousness while researching a case.
Fan Based Character
The character of Sean Robertson is named for the devoted junkie by the same name.