Riddles and Puzzles

A detective agency needs to hire a new detective. Three people apply for the job. They are all brought into a room and are told that whomever is able to find a certain clue will get the job. They are told that the clue is stuck inside a book about Cat Trainers at the local library, in between pages 167 and 168.

Two of the applicants got up and rush out the door, while the third remained. The remaining applicant got the job - why?