Actual rating: 3.5 stars
Spoilers below.
OSaT is a fun read. I was able to finish in one sitting because it keeps making me want to continue reading and see what happens next. I was one of Robin's beta readers, so I've read some previous drafts of the book. Even if I've read it through that way already and knows what's going to happen next, that didn't stop me from feeling bored or making me want to skip a part.
I enjoy the characters very much. Though Tobias is the main character, we also get Kase, a man who helps Tobias search for the spellbook. You can tell the differences between Kase and Tobias through the way they're written. Tobias's narration is simple and plain, while Kase tends to have his emotions affect his way of seeing and narrating things.
In the middle of the book, we're introduced to Aviva, the mage who owns the spellbook and lives in an enchanted forest. I wish we got to explore the enchanted forest a little more, especially since Aviva states that dark magic is affecting her forest and is corrupting it. It would have been nice to see the the corrupted side of her forest, even for a little bit. The only instance we got to see a corruption of the forest was when Aviva shows that the magic in the air is sick, and Tobias mentioning that they saw the corrupted part of the forest.
Regardless, Of Spellbooks and Thieves is a fun fantasy adventure book, and I definitely recommend picking it up!