When I met Susan Sontag in the summer of 2003, not much more than a year before she died, my overwhelming impression was of her unquenchable vitality. Six months later a routine test revealed she had a lethal cancer. Swimming in a Sea of Death is her son’s account of Sontag’s last days – her refusal to accept that her condition was hopeless, and the desperate struggle that followed after she opted for a bone-marrow transplant that seemed to offer a reprieve from death. She had defied the odds in the mid 1970s when she was diagnosed with advanced breast cancer, and lived through a rare uterine version of the illness in the late 1990s. When, in the spring of 2004, the cancer was diagnosed as being terminal, she believed she could beat the odds again.