Nightwatchmen is a skill book in The Last Stand: Union City.
Locks, surveillance, and ladies on page 4.
For the ultimate gossiper, this publication will let you know all sorts of embarrassing and dark secrets from your neighbors with the techniques necessary to do so. Learn to spy while your neighbor has the curtains down, open the locks of safes and doors where he might be hiding something from his dark past and, for eavesdroppers, watch teenagers doing the inappropriate without being detected. Why? Because you have nothing else to do with your boring life.
It increases the Security skill by a certain amount.