Tiffany and the Detective Dog — Will Perks

Tiffany really, really wanted a dog for her eleventh birthday. But when she woke up that morning, it wasn't a cute, fluffy puppy that greeted her in the garden; it was a big, stern Alsatian with grey fur and a very solid handshake. And he could solve mysteries. What on Earth is a girl supposed to do with her own detective dog?