The Day of Days, by Louis Joseph Vance, is a novel with gangsters, masques, a missing heiress, true love, and Kismet!
It was made into a movie in 1914.
Louis Joseph Vance wrote short stories, novels, and screen plays, many of which were made into movies. His most popular works were a series about “The Lone Wolf,” a charming rogue. He died in a fire — some say that it was spontaneous human combustion…
Thanks again to the mystery Post-Processor!