"The Motor Boys Over the Rockies; Or, A Mystery of the Air" by Clarence Young is a novel written in the early 20th century. This adventure story follows the escapades of a trio known as "The Motor Boys"—Ned, Bob, and Jerry—as they navigate challenges in their airship, the "Comet". Their journey is launched by the theft of their beloved craft, which propels them into a series of thrilling mysteries that intertwine their past adventures with new dilemmas, particularly an involving figure from their previous escapades, Jackson Bell. At the start of the novel, the boys are relaxing on a hot afternoon, debating where to go on their vacation in their airship. Their plans are abruptly disrupted when a frantic young boy arrives with news that their airship has been stolen. This revelation sparks immediate action among the trio, as they rush to investigate. They discover signs of forced entry and a missing watchman, Sud Snuffles. As they piece together what happened, clues lead them towards the involvement of their known adversary, Noddy Nixon, and to Jackson Bell, a mysterious old man whose story remains entangled with their quest to retrieve not only their airship but also unravel the larger mystery surrounding Bell's intentions. (This is an automatically generated summary.)