How did we get here? (assassins creed fanfic)

Three best friends luck begins to turn as their wildest dreams come true. Unfortunately, not in the way that they sought it out to be. Seeking the answers, protecting each other from driven forces, and thinking of ways to keep their cool they do things that not any 20th century teenager has ever done. Meeting with a famous assassin along the way, they will find the help they need to get back home.