It’s kind of complicated to explain (especially since I’ve only read about 30 pages) but I’ll try my best.
It takes place in Victorian London. and so far from what I’ve read it’s about these two children that can perform magic and they’re rivals and are supposed to fight each other in this peculiar circus called Le Cirque des Reves (french for The Circus Of Dreams). There’s more to it but that’s all I’ve gotten so far. :)