Underground Sea (#3)

The final book of the series about the exciting adventures of Max Tilt! 13-year-old great-great-great-great-great-grandson of Julya Vern Max Tilt thought that all his troubles are behind. Jules Verne’s legacy, found by Max and his cousin Alex, enabled the whole Tilt family to live comfortably, ride expensive cars and fly on private planes. But the trouble came from where they did not expect: Max's friend was a traitor! Super -secret serum is stolen! If she falls into someone else's hands, then disasters cannot be avoided... Max and Alex cannot allow this and go in search of the center of the Earth!