Fifteen-year-old Joyce Myers joins Sammy and Brian to help solve the one, two, three element mystery. One, an Amish buggy disappears. Two, twenty cut-out letters appear in its place. Three, someone threatens George Brock in his welding shop. The teen-age detectives try to find what these three happenings have in common. Five people have a need for a buggy, but only one has special plans for George Brock. The climax unfolds in Alex Austin's Steakhouse in Smoketown with a "grand opening" special.