Steven Moffat 
Doctor Who: The Day of the Doctor (Target Collection) [EPUB ebook] 

Discover the new Doctor Who classics. When the entire universe is at stake, three different Doctors will unite to save it. The Tenth Doctor is hunting shape-shifting Zygons in Elizabethan England. The Eleventh is investigating a rift in space-time in the present day. And one other the man they used to be but never speak of is fighting the Daleks in the darkest days of the Time War. Driven by demons and despair, this battle-scarred Doctor is set to take a devastating decision that will threaten the survival of the entire universe a decision that not even a Time Lord can take alone. On this day, the Doctor s different incarnations will come together to save the Earth to save the universe and to save his soul.