How about not saving John Lennon ?

Who never dreamt of travelling through time? Who never dreamt of changing the past or seeing the future?
This is the story of Gabrielle, Felicity and Abigail, three ordinary teenagers, who, on an ordinary day of school, had the craziest idea ever. An idea that will completely change their lives, and maybe even others'. They had the incredible idea of building a pan-dimensional doorway. Are you ready for this amazing journey through time?