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In late-eighteenth-century Ireland, accidental stargazer Caroline Ainsworth learns that her life is not what it seems when her father, Arthur, throws himself from his rooftop observatory. Caroline had often assisted her father with his observations, in pursuit of an unknown planet; when astronomer William Herschel discovered Uranus, Caroline could only watch helplessly as unremitting jealousy drove Arthur to madness. Now, gone blind from staring at the sun, he has chosen death over a darkened life.Grief-stricken, Caroline abandons the vain search, leaves Ireland for London, and tries to forget her love for Finnegan O'Siodha, the tinkering blacksmith who was helping her father build a telescope larger than his rival's. But her father has left her more than the wreck of that unfinished instrument: his cryptic atlas holds the secret to finding a new world at the edge of the sky.