Adventure Time, Volume 9 (Adventure Time #40-44)

Finn and Jake find themselves in the middle of a secret war when they inavertently take out Peppermint Butler's secret agent Candy Bar! There is something going on with the King of Ooo and the weird bears that he's hanging out with and it's up to Finn and Jake to get to the bottom of the King's dastardly plot! Now if only they weren't being accused of treason in the process.

Collects Adventure Time (2012) #40-44.