I very strongly recommened this book to all couples whether your are struggling with problems or just wanting to grow your relationship.
The book focuses specifically on married couple's relationships and reveals the beliefs and dynamics that drive us and hence our marriage relationship. Rather than prescribing how to fix marriage problems it opens the doors to your understanding and holds the door open for you, inviting you to step through and pursue the required path.
One of the core tenets of the book is that conflict is inevitable and a necessary and healthy part of a relationship; The key is to notice what the conflict is revealing, inviting you to see. I also like how they speak of focussing on `I' rather than `you' as in one's partner. Your partner is but a mirror in which you can look and learn about yourself and your behaviours and so grow. From that growth can flower an enduring, loving relationship with and your partner.