I Am The Master: Legends of the Renegade Time Lord

 was a collection of short stories from the life of the Master. It contained five short stories and a novella.

Publisher's summary
The Doctor and the Master; their conflict of light and dark has spanned many times and faces across the universe. This collection - of five short stories and a novella - explores the depths of darkness in the Master's hearts; the arch-schemer's secrets and sinister ambitions revealed through brand new adventures and encounters.

Join six incarnations of evil for undreamed of adventures: a quest to free alien warlords... a dangerous mission to save a vital ally... a meeting with Bram Stoker... a shattering of lives on a distant world... a trial of wits to gain untold power... and drop in on during his 77 years of imprisonment on Earth.