Clive Cussler writes a lot of books and they usually fit a basic formula. A bad guy does something, Juan and his crew on the Oregon use their special ship to stop the bad guy and then the bad guy is killed in the end.
In this story a Russian and his daughter hack into some banking systems and lock up the money belonging to Juan and his crew and lots of others. He plans to bring down the power grids in Europe and steal a lot more money. Juan goes after him. He uses his computer genius crew to work on the hacking problems. The Russian also is after Napoleon's hidden treasure. The crew also tries to thwart him in this area plus recover the treasure.
There is lots of fighting and discussions of high tech equipment both military and computer. Cussler always has some very advanced equipment in his books. Normally some of the characters would get injured but be ok in the end and so this was a little different to have one of the crew actually get killed, that was a bit sad.