Looking for a Book on Marriage, Similar to "The Love Dare"?

I am looking for a book on Marriage, I watched the movie Fireproof last night, and looked up the book "The Love Dare" later on. Although I really like the aspect of the day by day approach the book takes, and the activities the book asks the reader to do, I do not like that the book is so religious. I am... show more I am looking for a book on Marriage, I watched the movie Fireproof last night, and looked up the book "The Love Dare" later on. Although I really like the aspect of the day by day approach the book takes, and the activities the book asks the reader to do, I do not like that the book is so religious. I am looking for a non denominational book similar to "The Love Dare" that I can share with my wife and help improve my marriage. Any suggestions?
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