Summary
What if Snape got to Godric's Hollow before Him, and saved James and Lily? What if Dumbledore didn't die? What if Sirius didn't fall in to the veil? What if Snape was their only connection to Harry and the wizarding world? What if in order to save Snape from Voldemort's killing curse and to save their world Albus and Sirius needed to visit Albus' past?