Century Rain

Twenty-third-century Earth is an uninhabitable wasteland overrun by rogue nanotechnology. When archaeologist Verity Auger, studying the relics of twentieth- and twenty-first-century Earth, is accused of reckless endangerment after a child in her care nearly dies, shadowy government forces within her department offer her an out in the form of a mission to retrieve information from somewhere where her knowledge of the mid-twentieth century will be useful. Not until she is well underway do they inpart that her destination is an ALS (anomalous large structure) at the end of a wormhole in which 1950s Earth, slightly changed, is preserved. At that other end of the wormhole, Wendell Floyd is a Parisian PI working a case that gets stranger and more dangerous as he and partner Custine uncover the evidence, which is precisely the information Verity must fetch.