What would you do if you received a phone call from your best friend, who's plane disappeared three years ago?
John and Zach are best friends throughout all of high school, but once they graduate Zach moves to Paris for college. He always promised John he would come back and celebrate John's 21 birthday, but unfortunately his plane disappears and is never found.
Three years later Zach's plane lands and to all of the passengers it was a normal 7 hour flight. At first John is just happy that his best friend is back, but as time goes on Zach starts to act different. John tries to uncover the secret behind Flight 123.