Doom Buggy in Bloomington, MN

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.