Max (Maximum Ride, Book 5) by James Patterson
Maximum Ride and the other members of the Flock have barely recovered from their last arctic adventure, when they are confronted by the most frightening catastrophe yet. Millions of fish are dying off the coast of Hawaii and someone--or something--is destroying hundreds of ships. Unable to discover the cause, the government enlists the Flock to help them get to the bottom of the disaster before it is too late. While Max and her team are exploring the depths of the ocean, their every move is being carefully tracked by Mr. Chu--a criminal mastermind with his own plans for the Flock. Can they protect themselves from Mr. Chu's army of mercenaries and save the ocean from utter destruction?
Book 5 of 9 I was hesitant with this book because the fourth was SO HORRIBLE! There was still tons of overt political messages regarding the environment and global warming but at least the actions scenes got much better. It wasn't perfect as about half of the characters weren't given much time in the story but at least this time they had a real purpose to do something important. I liked that they were thrown in different environments and found the further mutations in the flock interesting. It ends on an interesting minor cliffhanger so now I'm looking forward to the next book to see where he's taking the characters next.
*synopsis and pic from amazon.com