One of Steve's many Doctor Who books, Timeless features the 8th Doctor, Fitz, Trix and Anji. It had 288 pages and was published on 4th August 2003. A good synopsis would be:
With time running out, the Doctor finally understands why 'our' universe is unique. In proving it, he nearly destroys the TARDIS and all aboard - and becomes involved with the machinations of the mysterious Timeless organisation. They can fix your wildest dreams, get away with murder and bring a whole new meaning to the idea of victimless crime. Soon, Fitz and Trix are married, Anji's become a mum, and an innocent man is marked for the most important death in the universe's long history. The reasons why force the Doctor into a deadly showdown in a killing ground spawned before time and space began.