It is the story of two women, one from Ireland and one from America, who trade houses without ever having met. They're both looking for an escape from their problems, but by running away, both come to discover a great deal about themselves.
The book mostly concentrates on the life of Ria Lynch, the Irish woman, who has met her future husband Danny Lynch. The two end up getting married, much to Ria's shock and delight, and start a family together while Danny's career takes off. Many years into their marriage, Danny begins spending less and less time at home with his wife and children. Ria believes another baby is the solution, and is shocked to find out that indeed her husband is going to be a father...but to a child from an affair he has been having with another woman. Her husband's unfaithfulness is the event that leads Ria into her decision to switch homes with the lady from America. Tara Road was made into a film in 2005.