But, the movie trilogy only followed the general storyline of the first novel, and had nothing to do with the 2 Ludlum sequels.
I kinda liked the The Bourne Legacy novel, though there were some glaring plot points that were never addressed, like
SPOILER (Highlight to View)
how Bourne was around 50 years old in the Bourne Ultimatum novel and was having trouble doing all the insane things he did, and yet, during Legacy, which takes place like 20 years later, he can take brutal beating and gunshots and methodical torture like he could when he was young.