The Lost Symbol
The antagonist of this book is the man named Mal'akh. At the end of the book you find out that he is actually the son of Peter Solomon who was thought to be dead many years ago. The antagonist is a huge man intricately decorated with tattoos covering every square inch of his body except the crown of his head. He is looking to have Robert Langdon solve the masonic pyramid because it is the one thing his father forbid him from doing. Mal'akh wants to cause his father the most amount of pain as physically possible since he abandoned him in a foreign prison. His way of revenge is to make his father have his son be the final sacrifice.