The Heterodyne Boys and the Mystery of the Cast Iron Glacier

One of the plays performed by Master Payne's Circus of Adventure. We haven't seen it staged, but it's important to the plot, because it was a performance of this play that convinced the late, lamented Lars to abandon his life as a cheesemaker's apprentice and join the Circus. Mentioned here, as a warmup before Lars and Agatha remember and rehearse some lines from the more consequential Race to the West Pole.