The following review comes from the Readers' Favourite site, and is by Michelle Stanley:
The Mumbersons and the Blood Secret (Grimhilderness Book 2) is a children’s fantasy by Mike Crowl and Cherianne Parks. A haircut turned into an ear cut when Billy Mumberson went to the barber. Things got more peculiar when a bedraggled looking elderly couple barges into his home, claiming to be his grandparents, and takes over running it. A text from his father asks Billy to meet him at the factory, but when Billy and his friend Olivia arrive there, they walk into a trap. The barber who had nipped his ear forces him into a room to extract more blood. Quick thinking Olivia rescues Billy, who wonders why his blood is in demand. They soon learn that the Mumberson family are in more danger, especially when Grandpa decides to sell his diamonds and the villains find out.
The Mumbersons and The Blood Secret is the sequel to Grimhilda! by Mike Crowl and Cherianne Parks. It is a charming story with magic, action, and a nice mystery that will keep children engrossed. I think the first chapter is very interesting since it gives readers a perceptive look into Billy’s character, his family, and Olivia’s too. The authors are creative in their writing and they seem to enjoy keeping readers in suspense since almost everyone that Billy meets and events that occur always appear suspicious. I like the main characters, Billy and Olivia, but found the others amusing, given their descriptions, attitudes and conversation. I highly recommend this fantasy book.