What is the ambler warning?

The Ambler Warning is a literary thriller novel by Robert Ludlum, published in 2005. It is named after the warning given to American agents when a foreign intelligence service discovers their activities. The novel is about a retired CIA agent named Hal Ambler, who is pulled back into the field after a colleague is killed and a file containing sensitive information is stolen. The story takes him across Europe and Asia, as he tries to unravel a conspiracy involving domestic and foreign enemies who will do anything to control the information.

The Ambler Warning has been praised for its fast-paced action and intricate plot, as well as its realistic portrayal of the intelligence community. It delves into the ethical concerns surrounding the use of intelligence-gathering methods such as torture, and the consequences of sacrificing personal ethics for the greater good. The novel has also been criticized for being too formulaic and predictable, as well as its general lack of character development. Overall, though, it remains a gripping read for fans of the genre.