He found out more about the books and had a go at drawing Mariella too.
If you want to have a go at drawing Mariella Mystery, just follow the steps in the video!
And don’t forget to let us know how you got on in the comment box below. We bet you did a lot better than Josh!
Click here to find out more about Mariella Mystery.
Remember, you can listen to Fun Kids on DAB Digital Radio in London and online across the UK! Click here to listen!