The Adventures Of Inky - Escape From London

Karl, a young boy who has always wanted a dog, adopts Inky, from Battersea Dogs Home for his birthday present.
As the story unfolds, Karl soon realises that
Inky has a more mysterious past than might be imagined!
Who is the Professor who reared him and what is his connection with MI6?
Can Karl help Inky lead a normal life and escape those at MI6 who want him back?