In the spring of 1947, outer space was an unexplored realm. But eleven year-old Alexis (Alex) Heart and her impulsive brother, Chuck, believe that the stars are within reach. In the midst of building their own rocket, Alex befriends Captain Ebbs, and an army scientist who is working to create food for future space travelers, and who is also a descendent of Captain John Smith. Alex soon introduces Chuck to her new friend, and the trio's shared interest in space travel sets off a series of adventures that the three will never forget. From meeting pioneering German rocket scientist Dr. Wenher von Braun, and a thrilling sailing trip down the Potomac to an island on the Chesapeake where a top secret rocket launch is about to take place, Alex and Chuck are about to have their lives forever changed.