The Marilynne Robinson trio. It sounds like a jazz ensemble! But no. This is a trio of three great novels.
A thread in the story is the relationship John Ames and his family has to Robert Boughton, a fellow minister in the town of Gilead who has been Ames' friend since childhood, and his family. In 2008 Robinson published Home, which unveiled what was happening withing the walls of the Boughton household during the days and weeks described in the pages of Gilead.