Libros de Ángela Posada Swafford (2 libros)

Simón, Lucas, Isabel, Juana, and their Chinese friend, Ming, discover that a mad scientist has orbited a rocket so dangerous that NASA must stop it before it reenters the Earth's atmosphere.

When Aunt Abigaíl reports on research into the human genome, Simón, Lucas, Isabel, and their friend Juana become involved in investigating the theft of a racehorse, terrorism, sabotage, and a very suspicious hospital.