Origins takes us back to the dive that started the nightmare for Jonas. (Main character of the MEG series) While this is a short e-book, I found the read mildly fun. (Getting it for free didn't hurt either)
This tale reveals the details around the shark that caused Jonas to flip out and be blamed for the death of the two scientists along for the ride.
There are a few subplot stories about scientist actually looking for the creature and then about subversive military man named Mac (whom you know from the later books).
All in all, this isn't the best Alten book. It doesn't have much of the shark but it does have the science that typically surfaces in his books. It does give the backstory but I wasn't sure the story needed to be revealed.
The other strike against this is that Alten has been promoting his Meg movie and sequel book for how long now? And we still have nothing. I realize making movies can be a difficult deal but my goodness. Don't give us the hope unless you have a director, script and actors all lined up!
Bottom line: You don't need to read this to enjoy the series. But nonetheless, I did because it was free.