MY DY:ING HUSBAND BECAME AN ORGAN DONOR AS HIS FINAL WISH

"He gave her back to us," Lily's mother said, holding my newborn daughter while I held her healthy four-year-old. "We were told she had weeks. And then a stranger, a dying stranger, sent his heart straight to her. We didn't know how to thank a person who was already gone. And now here you are, and you have his baby, and I don't — there aren't words, Grace. There just aren't."

There weren't. So we just held each other's children and cried, the two families my husband's heart had bound together forever: the one that lost him, and the one that lives because of him.

Lily is a bright, loud, healthy little girl now. She knows, in the gentle way you tell a child these things, that a very kind man gave her the heart that made her better. She calls it her "gift heart." And on our daughter's birthday every year, Lily's family comes, and the two girls — the one who has Mark's heartbeat in a bear, and the one who has Mark's actual heart in her chest — play together, and sometimes I watch them and I have to leave the room, because it is the most beautiful and unbearable thing I have ever seen. My husband, in two little girls at once. The recording and the real thing. His memory and his living heart, in the same backyard, laughing.

Chapter 5: The Heartbeat She Grew Up With

That was six years ago.

Our daughter is six now. Her name is Hope, which Mark chose, on the porch, before he ever got sick — we'd picked it when we were just happy and pregnant and sure we had all the time in the world. She has never known a night without her father's heartbeat, because that bear has sat on her pillow since she was an infant, and she presses its paw when she's scared, or sad, or just missing a daddy she knows only from photographs and a steady sound in the dark.