Knight School in Bloomington, MN

Sheltered teen Jack Pepper receives a nautilus shell from his estranged grandmother on his fourteenth birthday. When he holds it up to his ear, he's given coordinates to the middle of the Atlantic Ocean along with a time and date in the not-so-distant future. He embarks on the journey of a lifetime along with his new best friend Bowie Blackwood, a fearless, street-smart runaway.
A harrowing voyage combined with supernatural intervention transports the boys to medieval Atlantis. Upon their arrival, they are summarily captured and sentenced to death for espionage--following obligatory torture, of course. They are pardoned by the mystic leader Master Lumens who's been expecting them. They each have a higher purpose to fulfill, but first things first--a good education.
They are enrolled at Strongthorne Academy where they will learn to become knights
if
they can survive the four-year curriculum, goblins, enemy troops--and prom. For fans of Rick Riordan.