After her father throws himself from the roof of his observatory, Caroline leaves Ireland for London but finds herself drawn back in to her father's work, a cryptic atlas, where her father believed a new world lay at the edge of the sky.
Based on the life of Caroline Herschel, sister of famed astronomer William Herschel, who discovered several comets but struggles to be seen as anything more than her brother's sister.
Two scientists, one who creates black holes and one who seeks to prove the existence of God in the stars, are meant to be each other's soulmates, but do Irene and George believe in fate and destiny?
The lives of lovers past and present are revealed over the courses of comets passing overhead and how much their lives are affected by something out of reach.
Nantucket, 1845: Quaker Hannah Price spends each evening on the roof gazing out for comets, but when she meets a young whaler also interested in the stars above, their relationship develops into something else that Hannah might not be prepared for.