I haven't gone back in a few years to read some of the puzzles and I for sure "capped out" at some point, possibly just out of fatigue, but the book To Mock a M

I haven't gone back in a few years to read some of the puzzles and I for sure "capped out" at some point, possibly just out of fatigue, but the book To Mock a Mockingbird kind of themes all of it's problems around how birds have different songs. https://en.wikipedia.org/wiki/To_Mock_a_Mockingbird https://en.wikipedia.org/wiki/To_Mock_a_Mockingbird