The Love Dare by Stephen and Alex Kendrick.

[Love] always protects, always trusts, always hopes, always perseveres. Love never fails.
1 Corinthians 13: 7-8

The Love Dare is a challenge of 40 days for husbands and wives prepare to change their lives and their marriages. The book is really interesting because you are challenged to a task per day. You have to go step by step, day by day without omitting a task. If you follow the instructions for 40 days, you´ll learn to live a happier life with your beloved.
I read the Spanish version “El Desafío del Amor” and I also watched the film “Fireproof” (which is based on the book), and both are a great combination. I dare you to read the book and watch the film. Are you ready?

Butterfly