In a closed urban fantasy, the magical world is secret and no one knows about it. In an open urban fantasy, everyone knows about it. So with a closed fantasy, you have to figure out how the world keeps itself secret, and with an open one, you have to figure out how knowledge of magic has altered the world we know.
Cassandra ClareAlec's trying to get Magnus to take him seriously, but he's never told our parents about Magnus, or even that he likes, you know -" "Warlocks ?" Simon said.
Cassandra ClareTrue love cannot die,'" Will said, translating the inscription on the back in the light from the corridor. "I can't wear this, Magnus. It's too pretty for a man." "So are you. Go home and clean yourself up. I will call upon you as soon as I have information." He looked at Will keenly. "In the meantime do your best to be worthy of my assistance.
Cassandra Clare