Just finished the book. I'll put the synopsis in spoilers:
The main character in the book is Lloyd Simcoe (the man that Mark's wife has an affair with in the show). He works at CERN, where the Large Hadron Collider is located. The Flashforward is caused by a collision of two nuclei inside of the LHC. The plot of the book is that Lloyd and his partner Theo (presumably Dominic Monaghan's character Simon in the TV show) trying to put together what caused the Flashforward.
Sounds complicated, eh? That's why I'm glad the series hasn't followed the book so far as I can tell other than Lloyd's name.
If anyone wants the book, I'd be glad to send it to you. Just shoot me a PM.