Delia Ephron had struggled through several years of heartbreak. She’d lost her sister, Nora, and then her husband, Jerry, both to cancer. Several months after Jerry’s death, she shut down his landline, which crashed her internet. She channeled her grief by writing a New York Times op-ed. The piece caught the attention of Peter, a Bay Area psychiatrist, who emailed her to commiserate. Recently widowed himself, he reminded her that they had shared a few dates 54 years before, set up by Nora. Delia did not remember him, but after several weeks of exchanging emails and ’60s folk songs, he flew east to see her. They were crazy, utterly, in love. But four months later, she was diagnosed with AML, a fierce leukemia.