Listing to police scanners in Kings Row might lead you to a Rescue mission. These are easy if you know how.
First Off, You will appear in a hallway that forks. Take either one. After that, Go either left or right. REMEMBER YOUR CHOICE!!

Go through until you get to a hallway with elivators. Go up one of them.
Go out and Take either path. Then take either of the ?3? paths. Once you find the kidnapped person, Rescue them. YOU CANNOT STEALTH UP TO THEM!. Go back the way you came into the elevator. Go down. MAKE SURE THE PERSON IF FOLLOWING YOU. Now, remember hte path you had chosen? Go back through that one. Go back to the entrance. Wait ontil the kidnapped person is there and you get and mission successful message. Then leave.