The novella “Permafrost” by Alastair Reynolds was published for the first time in 2019.

Valentina Lidova is 71 when she has the opportunity to participate in an experiment involving the application of a mathematical theory developed decades earlier by her mother. Her interest is not scientific because the purpose of the experiment is to send her consciousness from 2080 to 2028 inside another person’s body. If successful, she may attempt to alter the past to avoid the approaching extinction of humanity in her present but there are many unknowns.