Imperial Clock // A Tale of Two Sisters — Robert Appleton

Facing a time of great turmoil across the Empire, Meredith and Sonja McEwan are the teenaged daughters of a disgraced scientist in Southsea, England. They've grown so close, so insular over the years, despising the world that despises them is all they know. But things are changing. Sonja has caught the eye of a dashing young teacher, and is falling in love, while Meredith, jealous, throws herself into solving the mystery of a powerful secret society in London, with devastating consequences. Tidal waves, assassins, mind-boggling steam technology and women's denim trousers are about to arrive in a big way. Meanwhile, the legacy of Professor Reardon's time jump continues to throw up surprises in an age where nothing is certain. And no one is who they seem to be.