Just finished this good new book, Ahsoka by E. K . Johnston. Technically a Young Adult type book, it was a quick read and well written.
The story takes our heroine from sometime after her departure from the Jedi Order up through her becoming intermingled with the growing rebellion under Senator Bail Organa.
She has to hide, and keep moving, and stay out of trouble. Until she can't ignore the problems the Empire is causing all around her. So she takes action, at first locally, then on a broader scale.
A good entry into the canon, I'd say. Ties in with Star Wars: Rebels, of course, as well as Clone Wars.