Alternate timelines and multiple realities vibrating at different frequencies are mostly associated with science-fiction narratives and especially with superhero stories.
Kate Atkinson’s 2013 slow-paced tour de force Life After Life, in contrast, is less about how big changes affect everyone, and more about how small changes affect small people.
Ursula Todd, the protagonist, is born in a snowstorm to an upper-middle-class British family in 1910. The doctor can’t get to the home, and Ursula strangles on her own umbilical cord.