The Dog Who Came In From the Cold by Alexander McCall Smith

The second installment in Alexander McCall Smith’s newest beloved series follows the further adventures of Freddie de la Hay, Pimlico terrier, and the wonderfully motley crew of his fellow residents in the elegantly crumbling London mansion block, Corduroy Mansions.
 
A pair of New Age operators has determined that Terence Moongrove’s estate is the ideal location for their Centre for Cosmological Studies. Literary agent Barbara Ragg has decided to represent a man who is writing a book about his time “hanging out” with the abominable snowman. And our small, furry, endlessly surprising canine hero, Freddie de la Hay, has been recruited by MI6 to infiltrate a Russian spy ring. Needless to say, the other denizens of Corduroy Mansions have issues of their own. But all of them will be addressed with the wit, charm, and insight into the foibles of the human condition that have become the hallmark of this truly peerless storyteller.