If you like Heroes of the Valley by Jonathan Stroud
Because you enjoyed the action and adventure in Heroes of the Valley by Jonathan Stroud, I have some other books you may enjoy.
If you haven't read Jonathan Stroud's Bartimaeus Trilogy, you may want to give it a try. In the first book, The Amulet of Samarkand, a magician's apprentice summons the djinni Bartimaeus and instructs him to steal the Amulet from a powerful magician.
Nick of Time by Ted Bell.
Nick McIver is no ordinary boy. He travels through time, fighting pirates and beating Nazis at their own game.
White Fox Chronicles by Gary Paulsen.
Imprisoned when a foreign power conquers Los Angeles in 2056, fourteen-year-old Cody escapes and becomes an underground hero called White Fox.
Stormbreaker by Anthony Horowitz.
This spy thriller is the first in a series of books about 14-year-old Alex Rider. When his guardian and uncle is murdered, Alex discovers that his uncle was a spy for the British government. Now the government wants Alex to take over his uncle's mission: investigating the makers of a revolutionary computer called Stormbreaker. Posing as a teenage computer whiz who's won a Stormbreaker promotional contest, Alex enters the factory and begins following clues left by his uncle.