<P> But John's lies are revealed when a video is released on YouTube . Henri is furious, and demands they leave immediately . John again uses his powers to stop him, and desperately races to the school, knowing that Sarah is in danger . He finds Sarah, but the Mogadorians have already arrived . The Mogadorians have brought an enormous beast called Piken, and smaller, but still deadly, creatures called Krauls . These creatures are sent to track and kill the Loric . John and Sarah are joined by Number Six (who has been looking for them since Three's death) and later by Henri, Mark, and Bernie Kosar ("the dog"). John sends Mark off, exhorting him to protect Sarah . A furious battle ensues, during which Six exhibits powers of invisibility and control of the weather, and Bernie Kosar is revealed to be a Chimæra . Sam arrives partway through the battle . </P> <P> John kills a soldier, Bernie Kosar battles a Piken, and at key moments John is helped by his human friends, but in the end they are depleted and weakened by numbers and power . Six is wounded and taken to relative safety . John uses an ability he was barely aware of to communicate with a beast brought by the Mogadorians and to turn it against them . Henri is killed, but before dying exhorts John to read a letter he left for him . John survives, though he is very weak, and the Mogadorians are defeated . </P> <P> Promising to return for Sarah, John leaves Paradise, along with Number Six, Sam, and Bernie Kosar . </P> <P> I Am Number Four has received mixed reviews . Kirkus Reviews wrote, "If it were a Golden Age comic, this tale of ridiculous science, space dogs and humanoid aliens with flashlights in their hands might not be bad ." The Chicago Tribune said, "There's genuine suspense...it's easy to get lost in the world of the sweet teen from another planet ." Booklist reviewed it as, "Terrifically propulsive ." Publishers Weekly wrote, "For those looking for an undemanding, popcorn - ready read, this "guy--okay, alien--gets the girl and saves the world" adventure should do the trick ." School Library Journal wrote, "With its interesting premises and a fast - pace telling, the story will grab readers who are willing to suspend quite a bit of disbelief . Others, who like their science fiction with a bit more science and internal logic, will have to search elsewhere ." The Horn Book reviewed it as, "Riveting ." It was on the number one spot of the New York Times Best Sellers List for 7 weeks and was on it for a total of 17 weeks . </P>

Summary of the book i am number four