Note: Mascarenhas, a professional psychologist, described her point of entry: "to think about how if we'd invented time travel rather than space travel, what involvement would psychologists have had? What stressors would they identify in time travel? And who would they be trying to recruit?" --Wikipedia, quoting an interview with the Los Angeles Times Chapter titles follow a template. Chapters 1 to 3 are headed (where colons represent new lines) "March–December 1967: Barbara", "July 2017: Ruby", and "January 2018: Odette". The dates of chapters 4 to 62 imply three story lines that run in sequence to 1999, to January 2018, and to April 2019.

Synopsis: Four women in England invent time travel in 1967. One suffers a breakdown and the other three establish "the Conclave" to control the technology. Fifty years later a murder is forewarned and uncovered.