Atomic Weight of Secrets or the Arrival of the Mysterious Men in Black (The Young Inventors Guild)
This was a very hard book to classify. It took place in 1903 which could make it historical fiction. There were those mysterious men in black which could make it science fiction. It was about a group of young geniuses who were suddenly taken from their families They deal with the uncertain nature of wondering about their parents, working on their inventions, and trying to discover more about the men in black. This was a slow-paced, old-fashioned sort of story that starts a trilogy.