[ad_1] <br><img src="https://opinion-images.wsj.net/im-25523232" /><br>A clandestine operation—tucked away on an higher ground of Rockefeller Heart—was important to Britain’s battle for survival in World Conflict II. <br>[ad_2] <br><a href="https://www.wsj.com/arts-culture/books/the-invisible-spy-review-manhattan-project-1a856fb4">Source link </a>