Dogtective William travels the world (1)

Adrian is twelve years old and an only child. He spends a lot of time with his dog, William, which the family got from the SPCA a few years ago. But only Adrian knows William's secret: he understands human language AND he can talk! William reveals this to Adrian in the car on their very first trip home from the SPCA. But Adrian learns even more secrets about his dog in this book, the first of a series featuring the Adrian and William's adventures all over the world.
Under the pretence of going on a soccer tour Adrian and William, who is a dog detective ('dogtective'), make arrangements to travel to Istanbul, where, in true espionage-style action, William's contact awaits. From there the hunt for the villain Scurvy Scabscratch take them to Venice, Paris, Amsterdam and finally to London, where Brumbum's mansion holds the key to the disapperance of the Silver Tulip.
With black and white line drawings by Chris Venter.