The USS Discovery's Chief Tactical Officer ... "Labyrinths," Captain Burnham is incapacitated by the final clue, a book called "Labyrinths of the Mind" written by Betazoid scientist Dr. Marina ...
However, Burnham and Book paid the Tribble no mind as it fell ... Commander Rayner found out why the USS Discovery's Tribble is not a threat in Star Trek: Discovery season 5, episode 3.