Parents need to know that The Demon Tide, the fourth book in the Black Witch Chronicles, is a mature fantasy read worth discussing. The series has always dissected ideas of prejudice and here it focuses heavily on prejudice related to the immigrant experience. There was a greater focus on sex in Book 3, The Shadow Wand, but characters, gay and straight, have sex in this book, too, with some detail about erections and birth control and bodies moving together. Overall, though, there's much more focus on meaningful, loving relationships and courtship than the sex part. Battle violence isn't gory, but there are two big battles with weapons, explosions, and dragons where many are slaughtered with casualties everywhere, including the bodies of children, animals, and bystanders. A few prominent characters are captured, beaten, and pelted with rocks. One main character dies in an explosion and another is possessed and forced to attack and harm her loved ones. A man threatening sexual assault is eaten by a kraken and others are attacked by krakens in a river. An immigrant mother drowns in front of her child, and other immigrants nearly die of fever. There's some wine drinking by adults and swearing that's rare and doesn't go beyond "s--t." We're going to go ahead and call characters racially diverse, even though their skin colors are green, violet, you name it, and they are fae, elfs, icarels, witches, lupines, dryads… because the characters deal directly with racial prejudice and it's clear that the biggest danger to this world they inhabit is racial division, exclusion, and hate.