In “The Vanished,” author RC Binstock melds two narratives into one memorable story. In it he recounts the slow, halting recovery of a family still trying to find its footing a year after suffering a horrifying, life-altering tragedy. This matching of two disparate arcs delivers a striking tale of hope and regeneration. Malcolm and Aaron, brothers in the Bernard family of Boston, each struggle in their own way to cope with the wrenching loss of their sister Barbara and her two small children,...