On Adventure Island

High‑spirited teenage pilot Terry Mapes loves nothing more than looping her blue‑and‑gold monoplane through the clouds, while her twin sister Prim prefers to sit back and enjoy the ride. The sisters share a deep bond forged by their late father, an airmail legend who taught them both to fly. Together they set off on a long‑range flight toward South America, their conversation buzzing with excitement and a hint of secrecy.

Terry’s mission is more than a joyride; she carries a crucial errand for her family, whose modest airfield is under threat from a ruthless rival. Joe Arnold, a scheming competitor, has been sabotaging the Mapes’ operations, endangering their livelihood and the safety of the pilots. As the twins glide over distant hills, they sense that danger may be waiting on the horizon, and Terry’s skillful handling of the Skybird will be tested long before they reach the wilds of Peru.