Marcus Mender: Troubled Tweens, Book Two
Marcus Mender can fix anything just by holding it. But now, he can't stop! Like King Midas and the golden touch, everything becomes new and perfect in Marcus's hands.
Before he can control his new power, the Troubled Tweens are sent to South America on a magical mission: to recover a rare magnetized lodestone before the Loki, the magic thieves, use it for their own selfish purpose.