The third book in a brilliantly funny new series for 6+ readers from bestselling Dirty Bertie author Alan MacDonald, about a boy and his incredible talking dog.

Sam had a very ordinary life, until Oscar the dog arrived on his doorstep. Because Oscar has a big secret – he can talk! 

Oscar usually has a lot to say on any subject, but in this book something makes him speechless . . . a CAT has moved in next door! And Carmen the pampered feline is almost as much of a nightmare neighbor as her owner, Mrs Bentley-Wallop. 

But Sam and Oscar have bigger things to worry about. When a jewel thief strikes, it's time for the daring duo to turn detective . . . Can they sniff out the culprit before it's too late?