I found free logic problems on Amazon for Kindles. Click on the image to be taken to the Amazon download page. This does not work for the Fire.
If you want an actual book, search for "Logic Puzzles for kids" There are tons out there!
Enchanted Learning has simple puzzles available online.
Puzzler's Paradise has some puzzles to try too!
Have fun and great work in class today! NO Homework (unless you still need to finish last night's!)
-Miss K :)