Each book has the Totally Ninja Raccoons encountering a cryptid -- a creature from folklore or mythology, whose existence is not currently confirmed by modern science. The "monsters" are presented in a fun, not-too-scary way, and readers are encouraged to do their own research to make up their minds about the possible existence of Bigfoot, werewolves, thunderbirds, sidehill gougers, the Loch Ness monster, and others.