Do I even need to review this book??? I mean, it’s an Enid Blyton book, for goodness’ sake! 
Well, I’ll write about it anyway.
This is the fifth book in the Barney mystery series. Barney, Diana, Roger, Snubby, and Snubby’s dog, Loony, appear in all the Barney books. Diana and Roger are sister and brother while Snubby’s their cousin. He has no parents so he’s always sent to live with relatives during his school holidays but he enjoys spending his holidays with Diana and Roger. Barney is their friend. He has a pet monkey called Miranda. Pretty name, huh?
By the way, it’s the winter holidays for the kids. Barney has finally found his father after an endless search for him and he’s spent Christmas time with his newfound family. After Christmas, Barney invites Roger, Diana, and Snubby to stay at a house owned by his grandmother by a lake and surrounded by hills. Of course, Roger and Diana’s parents agreed to let them have fun by themselves. A Mrs. Tickle will be cooking their meals, washing their stuff, and just basically looking after them.
So at the house, the children spent their time skating and tobogganing down the snowy hills and having the time of their lives. Meanwhile, at night, they hear mysterious knocking sounds like ‘rat-a-tat-tat, rat-a-tat-tat’. Haha! Can you imagine such sounds? To me, it sounds odd but there you go.
As usual, the children being their inquisitive selves and with a huge sense of adventure, they decide to investigate the sounds. They even found a large glove on the ground outside and Snubby thought he saw somebody standing outside looking at the house. Therefore, they found reason to suspect that something was wrong.
I’ve now read 4 of the books in the Barney mystery series. The other three are The Rockingdown Mystery, The Rilloby Fair Mystery, and The Ring O’ Bells Mystery. Being an Enid Blyton fan and one who has grown up reading her books, I find them enjoyable and a great way to ‘relive’ my childhood.