Archaeologist Verity Ogier excavates on Earth, depopulated three hundred years ago as a result of a disaster called Nanocost. When the expedition fails, Verity, in order to avoid prosecution and rehabilitate himself, agrees to carry out a secret mission. According to the "wormhole" created by aliens in space-time, she goes to the middle of the twentieth century - to pick up documents of exceptional importance that another agent from the future prepared for transfer to her before his death.