How to pronounce “detestable” in English

Well, I'm a former agency officer and I'm writing about the good guys versus the bad guys.But even in the book there are some pretty detestable CIA officers, including one traitor who's trying to sell secrets to the Russians.And you know, a book, a fiction, is something, at least in my case, you start writing Chapter One and I have no idea where the story is going to go.