Well, i don't know about influenced behaviour because no book has turned my personality around after reading it, but I can definitely list a few that has impacted and developed my knowledge, i call it influenced thinking.
Davinci code has to be number one on my list of influenced thinking books. The author (Dan Brown), killed it completely. I can't say I've come across any other book that is as compelling as this one. The book's focal point is centered on two ancient societal groups ( Opus dei and Priory of Sion), their activities revolving around the holy grail and hidden messages left in so many Christian pictures like the last supper.
Opus dei happens to be a Catholic prelature under the holy see who are tasked with the responsibility of finding the holy grail (the supposed cup used in the last supper) and stop it from destroying Christianity. Priory of Sion on the hand is more of a centuries old cult tasked with protecting the location of the holy grail from getting into wrong hands and their arch enemies Opus dei from finding it and completely erasing true history we don't even know about. During the course of the whole story, the book begins to reveal some of the most guided secrets about christianity, amongst them are the most common pictures we find in the bible of Christ and his disciples during the last supper. The book points to hidden clues and messages imprinted on the pictures by Davinci who was the original creator of the pictures. Some of the messages are mind blowing, unbelievable things you never thought was. The shocking twist at the end revealed the holy grail to be quiet something other than the last supper cup. It turned out that the holy grail was Mary Magdalene and her final resting place. You'd then realize why the Opus dei seeks the holy grail so it won't reveal the truth about Jesus Christ actual life. Some of the truth like how Mary Magdalene wasn't a prostitute as history has made us believe, how the Romans twisted history and made so many false insertions into the religion and then adopted christianity as a means of world control thanks to Constantine, and above all how Jesus Christ got married and fathered kids with Mary Magdalene. I can't even begin to think how Dan Brown came about all this information. The book sparked a lot of controversies when it was published. They even made a movie of it sometime ago...I turned okay but a lot of information wasn't in the movie as the book.
NB: Before you start attacking me with responses after reading this, just remember am not making it up, am only saying how it is in the book and I suggest you look it up.