Sherlock Ferret's well-whiskered friend Watson Mouse M.D. tells the story of how Mr. Montague Mole shows photographs of his family, but he has no idea who has taken them! Could it be a phantom photographer? As so often, the nefarious Moriarty Magpie appears to be involved, along with the mysterious Sir Basil Badger, who vanished several years before, after eating twenty-seven jam tarts (and lots of other delicious things!). But thanks to Sherlock Ferret's knowledge, his Big Books, and the Bakery Irregulars, all is put right in the end, and the Mole family can sleep safely all day (for the night is their busy time).