Hey guys this is the first crossover between these stories that I'm aware of. Anyways, since this is in Maximum Ride, I'll tell you about Gallagher Girls so if you haven't read it, you can catch up.
Basically, the Gallagher Academy for Girls is a top secret spy school for geniuses and children/relatives of spies. Cammie is the daughter of the headmistress, and is really good at blending in. She falls in love with a normal boy from the surrounding town, but has to break up with him when her mom finds out. Then they find a boy school like theirs (Blackthorne Institute for Boys), and she meets Zach, a boy spy, but they only kiss once, and she is obviously not over her ex, Josh. Her most important class is cove-ops, where they learn how to do missions.