Currently reading the last of the 3 available Hyperion "Lost" books (first two written by Hapka, last one by Thompson). Each book is roughly 160 pages. [That would normally be warning sign number one.]
The plot of each consists of taking an unknown (and uninteresting) character X from the island, have a bit of interaction with the main characters, then go through X's backstory via flashback every other chapter. The worst thing I found is these 3 books' characters are all absolute tools.
If you like the show, I recommend avoiding the books at all costs since they add nothing to the mythology (they are probably not allowed to). Big waste of time.