Making a poor choice with typography can really ruin any great design, especially book cover design, and especially when Comic Sans is the font of choice.
Thankfully, Matt Dempsey created Comic Sans Criminal to help the mislead. Their website helps you understand why Comic Sans was created in the first place, how its use evolved and why it is usually an inappropriate choice.
This little guide is well designed, fun to view and I actually learned some things I didn't know. CLICK HERE to view the site, and share it with your favorite Comic Sans criminal.