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 something has made him speechless - a cat has moved in next door. And Carmen the pampered feline is almost as much of a nightmare neighbour 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?