Spy vs. Spy is a LEGO Ninjago: Masters of Spinjitzu book that was released in 2015. It takes place within the plot of Season 4: The Tournament of Elements, during the events of the episode "Spy for a Spy."
It takes a ninja! The wise-cracking Masters of Spinjitzu are back with new adventures on Cartoon Network and new LEGO sets on sale everywhere.
An all-new adventure based on the latest season of the hit LEGO Ninjago TV show on Cartoon Network!