Ethics (German: Ethik) is an unfinished book by Dietrich Bonhoeffer that was edited and published after his death by Eberhard Bethge in 1949. Bonhoeffer worked on the book in the early 1940s and intended it to be his magnum opus. At the time of writing, he was a double agent; he was working for Abwehr, Nazi Germany's military intelligence organization, but was simultaneously involved in the 20 July plot to assassinate Adolf Hitler. The central theme of Ethics is Christlikeness.