The Last Doctor: Legend of the Maze Master Book 2 : Past Lives

Sequel to Book One of a Crystal Maze/Doctor who crossover Trilogy. Ed has forgotten he is a Time Lord, until his previous regeneration known as Reckless Rick turns up demanding to take the power crystals - but why is the Tardis, manifesting as Idris, refusing to give them up? And what is the dark secret that the Tardis is keeping from her beautiful thief? *Dr Ed/Dr Rick/Ace/Idris*