Clare Mackintosh’s very touching book “After the End” explores an inexplicable decision and the two conceivable courses fate might take. Max and Pip a resilient couple whose son develops a critical illness, are at the center of the narrative. They are at odds about their son’s future for the first time. The novel examines marriage, love, parenthood, and the path less traveled, leading the family from an unfathomable loss to an unexpected, fulfilling, and redemptive conclusion. This fascinating investigation shows how sometimes the finale is only the beginning.