Honor Among Thieves by Rachel Caine is one of the best series I ever read. This series is about a futuristic world, where humans have invented intergalactic travel and met a type of aliens called Leviathan. These Leviathan are gigantic aliens that take are living spaceships and they made a program called Honors. In this program, humans are chosen to go on these Leviathan to supposedly explore the outer reaches of space.
Zara Cole, or main protagonist, is a thief and she got recruited into the Honors program for some reason. There, things take a dark turn, and Zara, her copilot, Beatrice, and her ship, Nadim, must try and survive.
I enjoyed this book a lot because it was fast paced and had many interesting plot twists. I would recommend this book to people who enjoy action packed, sci-fi books.