Billion-Dollar Brain was filmed as Billion Dollar Brain in 1967, the third installment of the Harry Palmer series of films based on Deighton's novels, featuring Michael Caine; it was a commercial flop. Billion-Dollar Brain Billion-Dollar Brain is a 1966 Cold War spy novel by Len Deighton. It was the fourth to feature an unnamed secret agent working for the British WOOC(P) intelligence agency. It follows "The IPCRESS File" (1962), "Horse Under Water" (1963), and "Funeral in Berlin" (1964). As in most of the author's novels, the plot of "Billion-Dollar Brain" (1967) is intricate, with many dead ends. The unnamed protagonist is ordered
The IPCRESS File his attempt to sell information to the protagonist had been a test of his loyalty, which the protagonist had passed by rejecting it. The novel ends with the protagonist concluding his report to the Minister, revealing that Jay has turned and began working for the British, while Dalby has been executed and his death covered up as a car accident. In 1992 Deighton said that the inspiration to write the novel came from his real-life neighbour Anna Wolkoff, a White Russian émigré who collaborated with a cipher clerk from the American embassy to spy for Germany in World War II.