This series offers a detailed peek into the world of espionage. Readers learn how cyber security is needed to prevent government sites from being hacked, how spies communicate with their handlers, and of how different surveillance methods such as drones and bugs are employed. Some history of spying is also related; Mata Hari employed her charm and sexuality to spy on the French and Germans during World War I, World War II spy Nancy Wake was able to elude the Nazis, and Navy SEALs used intelligence to take down Osama Bin Laden. Photographs complement the texts. The narratives are detailed and make for interesting reading; history buffs will enjoy how wars were influenced by spies who were able to pass on intelligence and those interested in technology will appreciate mentions of modern spy weapons like drones. VERDICT Interesting facts combined with a readable presentation will make these volumes appreciated by browsers and report writers alike.