I think 'Goldfinger' is among the most popular. It has that iconic villain and the exciting story of trying to stop his evil plan. Also, 'From Russia, with Love' is very popular as it has a great blend of espionage, action and a touch of romance.
One of the most famous James Bond novels is 'Casino Royale'. It introduced Bond to the world in a big way, with its thrilling plot of high - stakes gambling and espionage.
Probably 'Casino Royale'. It was the first Bond novel and really set the tone for the series. It introduced Bond's character, his gambling skills, and his way of dealing with enemies.