Aidan Redding's entire goal for her time in this universe: behave. For once. Discovering seafaring aliens trashes that plan.
The aliens raise questions. Her co-workers raise more.
The answers explain it all. And ruin everything.
On a world where gravity changes every second, Redding finds herself involuntarily allied with a mathematician from Soviet Texas as she races to save not just herself but civilization.
Forget aliens. Nothing threatens Earth's golden age so much as ordinary human beings.