Someone mentioned Grokking Algorithms by Aditya Y. Bhargava in one of the CS educator Facbeook groups. It looked interesting so I thought I'd give it a once over. It's certainly an accessible book. Text mixed with cute line drawings, "hand written" text, diagrams and picture.s It reminded me of one of my favorite, most accessible Calculus books Who Was Fourier. Overall I enjoyed the book but I'm not sure what its best audience is.