Skullduggery is the second Bloodwater Mystery and you don't really need to read the first to figure out what's going on. Roni and Brian don't have much in common other than solving mysteries. During a field trip they stumble upon a man injured in a cave. The man, Dr. Dart, is an archaeologist trying to find evidence that Indian Bluff is of archeology worth and shouldn't be turned into a housing development. When Roni and Brian find him, he'd been knocked unconscious after finding a pile of bones. However, since his head injury, he hasn't been making enough sense to present his case. In walk Roni and Brian who take over his case, trying to find clues about the bones and the cave, as well as figuring out a way to stop the bluff from being turned into condominiums.
Roni and Brian are likeable characters, which gives this series potential. This might just be the modern day version of Nancy Drew or the Hardy Boys.