Sylvain Neuvel dropped out of high school at age 15. Along the way, he has been a journalist, worked in soil decontamination, sold ice cream in California, and peddled furniture across Canada. He received a Ph.D. in linguistics from the University of Chicago. He taught linguistics in India, and worked as a software engineer in Montreal. He is also a certified translator, though he wishes he were an astronaut. He likes to tinker, dabbles in robotics and is somewhat obsessed with Halloween. He absolutely loves toys; his girlfriend would have him believe that he has too many, so he writes about aliens and giant robots as a blatant excuse to build action figures (for his son, of course).

A girl named Rose is riding her new bike near her home in Deadwood, South Dakota, when she falls through the earth. She wakes up at the bottom of a square hole, its walls glowing with intricate carvings. But the firemen who come to save her peer down upon something even stranger: a little girl in the palm of a giant metal hand.

Seventeen years later, the mystery of the bizarre artifact remains unsolved—its origins, architects, and purpose unknown. Its carbon dating defies belief; military reports are redacted; theories are floated, then rejected.

But some can never stop searching for answers.

Rose Franklin is now a highly trained physicist leading a top secret team to crack the hand’s code. And along with her colleagues, she is being interviewed by a nameless interrogator whose power and purview are as enigmatic as the provenance of the relic. What’s clear is that Rose and her compatriots are on the edge of unraveling history’s most perplexing discovery—and figuring out what it portends for humanity. But once the pieces of the puzzle are in place, will the result prove to be an instrument of lasting peace or a weapon of mass destruction?