Matt Cruse Series; (Airborn, Skybreaker, Starclimber): This series on Matt Cruise, who starts out as a cabin boy aboard the Aurora Airship, and follows his adventures, along with you Kate de Vries. This book is set in the fictional 1930's (cerca) and is set in a world where airships (blimps) not planes, rule the sky. Highly Recommended.
Alex Rider Series: The first book opens with 14-year-old orphan Alex Rider, the title character of the series, learning that his legal guardian and uncle, Ian Rider, has died in a car accident. Suspicious about the circumstances of his uncle's death, Alex decides to investigate and discovers that Ian was assassinated while working for MI6. MI6 recruit Alex and place him in a gruelling SAS training camp, before sending him undercover to continue his uncle's investigation of Herod Sayle, a Lebanese businessman. Successful in this mission, MI6 continually find new ways to blackmail Alex into working for them, and other intelligence agencies. Alex, during his missions, discovers that several members of his family have worked for MI6, including his father, his uncle, and his godfather.
The characters Alan Blunt, head of MI6 Special Operations, and his second-in-command Mrs Jones appear frequently in the franchise, usually to brief or debrief Alex.
The series is similar to the James Bond franchise in many ways, as both feature MI6 agents as their protagonists. One of the main antagonists of the Alex Rider series is the organization 'SCORPIA', similar to SPECTRE in the James Bond franchise, and Alex is often equipped with a wide array of gadgets supplied by MI6. (exert from Wikipedia) Highly Recommended.