"Look there! Look! See it?" the boys shouted. "It's a helicopter beyond Finney's field. Let's go!"

With that, the triplets, Abercrombie, Benjamin and Christopher are off on another adventure—one that leads into most exciting happenings.

Before the adventure they find out a great deal about helicopters, and make a play helicopter of their own—but the adventure is with a real helicopter and its very interesting pilot.

From the dust jacket