'A Long Way Down' follows four strangers who meet on the roof of a London building on New Year's Eve, each intending to jump. Martin, a disgraced TV presenter; Maureen, a burdened single mother; Jess, a rebellious teenager; and JJ, a disillusioned American musician, find their solo exit plans foiled when confronted by the others. As they reluctantly decide to come down from the ledge, a pact is formed to postpone their plans until Valentine's Day, setting them on an unexpected journey. Through humor and heartache, Hornby explores the unlikely friendships, life's profound questions, and search for hope against the backdrop of a city that brings both despair and second chances.