These three Fringe novels describe events in the lives of the three main characters of the Fringe TV series. I found the writing to be dull, the characters off, and some of the events either unplausible at best (even for Fringe) or too convenient. The third book was the best of the lot. It really is a pity that the author couldn't pull off properly researched tie-in novels.
NOTE: If you haven't watched the series, these books will make no sense to you.