The Runabout

I love love love Kristine Kathryn Rusch's Diving Universe, which saw the release of The Runabout this year (which is currently on my ballot for Best Novella as well as Best Series). The series focuses on a spaceship-wreck-exploration company, and includes time travel and lots of mystery, action and adventure. The Runabout, and its predecessor The Falls, while they each stand alone, are intertwined stories - but I recommend reading the rest of the series from the beginning, because there's background and worldbuilding, especially in the first 2 books, which really enhance the rest of them.