Series like Cherub or Alex Rider

[cashewsoralmonds]

My son's favourite series is Cherub by Robert Muchamore. He also enjoyed Alex Rider. Any other suggestions for series he might enjoy. He is not into fantasy. Thank you

Special Forces Cadets by Chris Ryan
Young Bond series
Charlie Thorne by Stuart Gibbs
Bear Grylls’ Mission Survival series

Assume you've also done the Henderson Boys series (prequels to Cherub)
Hardy Boys
3 investigator