The Doctor's Destiny Book 4 : Legion of Steel

Set 20 years after Phantoms. When the Doctor and Ace's daughter Alice asks about the past, she decides she wants to meet Rebel, the Doctor's 14th incarnation. The Doctor agrees, but they find him alone, and haunted by the past as he relates the tale of the day everything he held dear was shattered forever by a clash with the Doctors deadliest of enemies: The Cybermen...