This is a story from each of the first 12 doctors, one story for each. Each story is written by a different author in a different style. It isn’t readily clear which doctor is represented by what story, some are obvious. It seems they are in chronological order.
I felt that each story is too independent, it might have been nice if something tied them together more.
Some of the stories are good, some are weak. Overall, they are enjoyable.