Voyage of the Mourning Dawn (Eberron: Heirs of Ash, Book 1)

A young street thief finds herself embroiled in a quest to find a powerful super-weapon thought lost during the final days of the Last War. She's never known anything but the dingy streets of her own city, but she is taken in by the crew of the airship "Mourning Dawn" and soon finds herself in strange lands filled with wonders and horrors beyond her wildest dreams.