The book explores their sibling rivalry and different strengths—Evan is people-smart, while Jessie is math-smart—as they engage in a five-day "war" to see who can earn the most money, with the loser's earnings going to the winner. The rivalry escalates to unethical actions like sabotage and theft, but it ultimately leads to reconciliation as they learn to work together and understand each other's perspectives.

Spy book series vary widely, from kids' adventures like Stuart Gibbs' Spy School (average kid recruited to CIA school as bait) to adult thrillers like Ted Bell's Alex Hawke (billionaire joining MI6 to stop terror) or historical fiction like The Book Spy (librarian spies in WWII), focusing on espionage, secrets, danger, and complex characters navigating missions, betrayals, and high-stakes conflicts for national or personal gain. 

 Framed Book 1:

A budding genius gets recruited by the FBI to find stolen art in this first book in the hilarious middle grade mystery series that has "elements of Alex Rider, James Bond, and Sherlock Holmes" 

 Vanished Book 2  :

In Washington, D.C., twelve-year-old Florian Bates, a consulting detective for the FBI, and his best friend Margaret must uncover the truth behind a series of private middle school pranks that may or may not involve the daughter of the President of the United States. 

Trapped Book 3: 

Middle schoolers Florian and Margaret are determined to catch a spy who is implicating their FBI supervisor, Marcus Rivers, in a variety of crimes--even if they have to break into, and out of, the Library of Congress to do it.