Part love story, part medical mystery, here is Martha Weinman Lear's wrenching follow-up to her bestselling memoir, Heartsounds It begins late one afternoon in her kitchen. There is no collapse, no massive pain. Just a slight fluttering sensation in her chest, then chills, and finally, nausea. Probably nothing to worry about, the doctor assures her on the phone. It doesn't sound like a heart attack. But it is. Heart attacks...