**THE SUNDAY TIMES BESTSELLER**Alexandr and Christine and Zachary and Lydia have been close friends since they first met in their twenties. Thirty years later Alex and Christine are spending a leisurely summer evening at home when they receive a call from a distraught Lydia. Zach is dead.In the wake of this profound loss, the three friends find themselves unmoored; all agree that Zach was the sanest and kindest of them all, the irreplaceable one they couldn’t afford to lose.