A good follow up to Into the Dim. YA time travelers based out of Scotland venture back to the the Gilded Age to stop their enemies from stealing a vital secret from Nikola Tesla himself; a secret that could reshape the universe as we know it. Interactions with the Vanderbilt family and time spent in a late 19th century sanitarium are added elements in the race to save history.
Not quite as good as the first book but still a decent read.