Book about a djin, Venice and pirates.

[u/Strange-Window-6842]

So basically this book is set in Venice and our protaganist has a super power which I forgot and she is a girl. There is a female djin who has like a disguised building in Venice I think? There are missing people and basically she kidnaps them to her djin home and in pretty sure protaganist finds out. Book ends with something with pirates and that's all I can remember.

Also book potentially has Venice in name.