During war people send messages in code. This is a story of the code breakers. They had to swear they wouldn't tell anyone about the content of the messages...
William Morrow sent me an ARC of this book to review (thank you). It has been published and you can get a copy now.
They had machines that worked on the codes. The people looked for the words that would crack it. They had men and women both working on it. The women had romances that didn't last long. The war took a lot of victims.
There are three friends that find they can't share everything like they used to.
Then they find someone is turning secrets over to the enemies. No one has any clue who it is.
One of the friends is in a mental asylum. She's very smart but they plan to do a lobotomy on her. She sneaks letters to her friends. They aren't happy about it but they come. By the time they arrive, she's figured out who the traitor is. But can they prove it?
Being a code breaker works on you, but they aren't giving up. They start digging for more info...