The second in the adventure series, this is THE MYSTERY OF THE DISAPPEARING CAT. This 170 page hardback by Enid Blyton is the 1956 printing. 

Lady Candling lives next door to Pip and Bets, and owns some very expensive, pedigree Siamese cats. When her most famous cat, Dark Queen, goes missing, the gardener's help, Luke seems the obvious suspect. Mr Goon and Mr Tupping, Lady Candling's gardener are sure he's the culprit, as he was digging by the cat house all alone when Dark Queen disappeared. The Five Find-Outers must solve the mystery to clear the name of their friend Luke. Strangely, Dark Queen soon reappears, dirty and tired, but unhurt. And stranger still, she disappears again a few days later, once more when only Luke could have done it. Piecing together clues of pale paint, turps and some wellington boots, the Five Find-Outers prove, once more with the help of Inspector Jenks, not only that Luke is innocent, but that Mr Tupping took Dark Queen and deliberately tried to frame Luke for the crime. Great adventure in this CHILD owned book in acceptable condition. First couple of chapters have the most markings but other pages have minor marking, words circles and other minor marks. Doesn't seem to harm the text. Childs marking on inside front board and most of adjoining blank page. Some light age spotting on inside front blank page with marking and inside back blank page. Some other light spotting scattered in the book but mostly seems in the margins. Book is slightly cocked. Marking on front board. Rubbing on board corners. Light wear on board edges and spine ends. STILL a great book to have in that spot on your shelf!! Shipping and handling 3.90 Media Mail to US destinations. Canadian residents 23.40 First Class mail. All others welcome but extra postage required and shipped entirely at your risk.