Lochinvar

From the young adult novel Ginny Gordon and the Mystery of the Old Barn (1951). The Hustlers have sold the swap shop to Joe Dakor, and their new project is a snack barn as a hangout for young people. The plot here, dealing with two criminals who had a falling out, is similar to the third Trixie Belden book, The Gatehouse Mystery. Here, though, it is not a diamond, but cash money that is left behind. One sub-plot deals with the arrival of "Lochinvar," a "hillbilly" (not yet rock and roll or country and western) singer who performs at the Harristown Inn (drawing the teen-aged crowd away from the Hustlers' snack barn).

From http://en.wikipedia.org/wiki/Ginny_Gordon