A mystery unfolds on night patrol when Jack and Jo stumble across a troubled stranger who carries a message for the Heelers that they won't forget. When Jack and Jo draw the short straw, night patrol finds them embroiled in a case that involves an abandoned suitcase and a mysterious stranger. Throughout the night, each of the Heelers stumble across the stranger at different times, but when dawn arrives, he reveals a reason for his visit that deeply affects them all.