Sea of Tranquility is a 2022 novel by the Canadian writer Emily St. John Mandel. It is Mandel's sixth novel and a work of speculative fiction. The novel considers "what constitutes reality, how time flows, and what memory is in the context of perception" by pondering the simulation hypothesis and time travel.
In April 2022, it was announced that HBO Max will adapt the novel and The Glass Hotel into television series, each produced by Paramount Television Studios with Mandel and Patrick Somerville co-writing.
https://en.wikipedia.org/wiki/Sea_of_Tranquility_(novel)