Secrets of the New World - Infini Calendar, #2

Unruly Austrian princess Farahilde Johanna returns in her own steampunk adventure. Her brother the emperor drags her to America to secure a technologically advantageous alliance with George Washington. But once she arrives, she becomes embroiled in multiple conspiracies, not all of them devised by human hands. She doesn't know what's worse, the assassination attempts, the otherworldly invasion, or her arranged marriage to a Prussian prince.
She might just save the world if she doesn't start a war in the process.