Ryan and Essie — Sarah Scheele

The story of how Ryan and Essie went into a great new world--and what they did there . . . All his life, 11-year-old Ryan has dreamed of becoming an astronomer--but not, it turns out, of actually going into space. When a public event brings a complete stranger named Essie to the observatory his father directs, she bounces into Ryan's alcove. Ryan's life will never be the same again. And neither will the lives of a whole lot of other people.