When the world is at threat of being taken over by an old villain, it is up to a group of people to work together and travel through familiar places to collect various items to help them win the war for justice. However, with brutal injuries and much drama happening at almost every moment, will anyone make it through this mission alive?

A novelization of "Mario & Luigi: Bowser's Inside Story". When Fawful tricks Bowser into sucking Mario, Luigi and Peach into his hammerspace, it falls to an unproven young Star Sprite to keep everyone alive and unaware of how much danger they're really in as they struggle to prevent a powerful evil from engulfing the world in darkness.

Ludwig von Koopa enters a business partnership with his brother Larry to help him break into the popular music industry. Having his money-grubby brother for a manager, however, turns out to be more than the brilliant classical artist had bargained for.