Edwin St. Andrew is eighteen years old when he crosses the Atlantic by steamship, exiled from English polite society following an ill-conceived diatribe at a dinner party. He enters the forest, spellbound by the beauty of the Canadian wilderness, and suddenly hears the notes of a violin echoing in an airship terminal ? an experience that shocks him to his core.

Two centuries later a famous writer named Olive Llewellyn is on a book tour. She's traveling all over Earth, but her home is the second moon colony, a place of white stone, spired towers and artificial beauty. Within the text of Olive's bestselling pandemic novel lies a strange passage: a man plays his violin for change in the echoing corridor of an airship terminal as the trees of a forest rise around him.

When Gaspery-Jacques Roberts, a detective in the black-skied Night City, is hired to investigate an anomaly in the North American wilderness, he uncovers a series of lives upended: the exiled son of an aristocrat driven to madness, a writer trapped far from home as a pandemic ravages Earth, and a childhood friend from the Night City who, like Gaspery himself, has glimpsed the chance to do something extraordinary that will disrupt the timeline of the universe.

The award-winning author of Station Eleven and The Glass Hotel, Emily St. John Mandel returns with a novel of time travel and metaphysics that precisely captures the reality of our current moment. Sea of Tranquility is virtuoso performance that is as human and tender as it is intellectually playful.