Jill was not my closest friend. Some craven times, I blessed myself with that—at least I was spared that. There had always been Julie, since fifth grade my heart, my sharer. But Jill was my good friend. We had been soccer moms together, and walking buddies, although Jill’s swift, balanced walk was my jog. I once kept Belinda at my house while Jill went to the bedside of her beloved father who’d suffered a stroke, just as she kept Stefan at her house with Belinda when they were seven and both had chicken pox, which somehow neither I nor my husband, Jep, ever caught. And on the hot night of that fundraising ball for the zoo, so long ago, she had saved Stefan’s life.

Since Jill was a widow when we first met, recently arrived in the Midwest from her native North Carolina, I was always talking her into coming to events with Jep and me, introducing her to single guys who immediately turned out to be hopeless. That hot evening, along with the babysitter, the two kids raced toward the new pool, wildly decorated with flashing green lights, vines and temporary waterfalls for a “night jungle swim.” Suddenly, the sitter screamed. When Jill was growing up, she had been state champion in the 200-meter backstroke before her devout parents implored her to switch to the more modest sport of golf, and Belinda, at five, was already a proficient swimmer. My Stefan, on the other hand, sank to the bottom like a rock and never came up. Jill didn’t stop to ask questions. Kicking off her gold sandals, in she went, an elegant flat race dive that barely creased the surface; seconds later she hauled up a gasping Stefan. Stefan owed his life to her as surely as Belinda owed her death to Stefan.

In seconds, life reverses.

Jill and I once talked every week. It even seemed we once might have been machatunim, as they say in Yiddish, parents joined by the marriage of their son and daughter. Now, the circumstances under which we might ever exchange a single word seemed as distant as the bony hood of moon above us in the melting darkness.

What did she want here now? Would she leave once Stefan came through the gates? In fact, she left before that. She got back into her car, and, looking straight ahead, drove off.

I watched until her car was out of sight.