Mister Monday (The Keys to the Kingdom)

Arthur Penhaligon was supposed to die and early death, but his life was saved by a key shaped like the minute hand of a clock. Arthur is safe, but his world is not, with the key came a plague brought by bizarre creatures from another realm, a realm contained in a house only he can see. Dog-faced creatures called Fetchers, sent by the sinister Mr. Monday, will stop at nothing to retrieve the key-even if it means destroying everything. Includes After Words by the Author.