There have been mentions in different articles over the years that Caleb Carr is currently working on a third Alienist novel. For example, an article in The Age from 2005 made a small mention on the last page of the interview that Caleb Carr is "currently working on [a] third Alienist novel". Additionally, the official website for Merlin, an opera that Mr. Carr is writing the libretto for, also contains a statement that he is currently "continuing work on several creative projects, including a new "Alienist" volume". Despite these references, no further detail about a third novel has been provided so it is difficult to predict when - or indeed, if - publication will occur.