What does it mean to live without the person you loved most? In The Sum of Grief , chaplain and grief counselor Jessica Shannon explores the quiet arithmetic of loss-the calculations we make when we measure our days against the absence of someone who shaped them. Drawing from her own experience of losing her mother at seventeen and years of walking alongside the grieving, Shannon offers a framework that validates what so many feel but rarely hear spoken aloud: grief isn't a problem to solve. It's the proof of how deeply we loved.