Never blow your cover. Never get caught. And never, ever fall for the guy. A trio of undercover teens become experts in espionage in this bind-up of three spy stories. Jo, Caylin, and Theresa were just average girls until they were chosen by a top-secret organization to be trained as a trio of spies to protect the world from any and all dangers and disasters. And while training might've been a cinch, the girls have no idea what's in store when they have real missions in the field. From preventing an assassination by infiltrating the American embassy in London, to tracking down a missing ballerina in Eastern Europe, to taking down a techno-terrorist group in Seattle, the girls' adventures never stop. With everything at stake, Jo, Caylin, and Theresa must make the right choices.

But even with all of their gadgets, training, and teamwork, some obstacles are just too much to handle. And sometimes love can be the biggest obstacle of all.