“Sea of Tranquility” is a time travel novel about art, love, humanity, and the plague. We follow multiple journeys: the exiled Edwin St. Andrew, who travels to Vancouver Island in 1912, Mirella Kessler, who in a pre-pandemic 2020 is in search for her long lost friend Vincent Alkaitis, Olive Llewellyn, a famous postapocalyptic author who is on Earth’s last book tour in 2023, and finally Gaspery-Jacques Roberts, who works as a hotel detective on a Moon colony in 2401.