We're going on an excursion to Zagreb with the wacky geography teacher McFinnegan. Initially, it seems like a completely normal day at the Flying School, but it soon becomes the next great adventure for the ACE scouts. The four set off on the trail of an enigmatic phantom that is said to live within the catacombs found under the Zagreb theatre. When they enter the underworld through a mirror, they not only come across a legendary machine created by the ingenious inventor Nicola Tesla, but also a hundred-year-old monster...

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