Mark is calling Rusty’s cell phone which is currently being used to Trail (ha!) Juanito and the stolen artifacts…  using the Snap-n-Rap app… or something like that…

I think we refer to this as a plot twist… although it now takes months to get to one in the Trailverse.  One of my favorite twists from the old days was when the old man with the indian artifacts spilled maple syrup on the wicker “pack-baskets” used to hide the (apparently) highly valuable and prized arrowheads and stuff… which led a bear, and Mark Trail to the cache where they were buried… and justice prevailed!