I love stories.
Human Nature by Paul Cornell is the book which the Tenth Doctor TV episodes 'Human Nature' & 'Family of Blood' are based on, but the book is way better! For me this is one of the best Doctor Who novels ever published, and the audiobook version read by Lisa Bowerman is magnificently good, bringing Paul Cornell's novel of humanity to life.
This is a Seventh Doctor story with Bernice Summerfield as his companion, and was originally published as part of the New Adventures range in 1995 when there was no Doctor Who on the TV. The plot of this book is similar to the TV adaptations of course, but the details are quite different, so this book can be enjoyed separately from the TV episodes without any real conflict... unless you are a person who wonders how the same story can fit in to Doctor Who continuity twice, with two different Doctors!
Human Nature is a Doctor Who story about love, war and the emotions that make people tick, which features real characters not cardboard cut-outs. I thought the alien villains were a bit weak when it comes to being fearsome, but that is only a small minus to an otherwise excellent story.