A boy over heard me talking about the Harry Potter books and he recommend the book "Mister Monday" by Garth Nix. The story is about Arthur Penhaligon. He finds a key in the shape of a clock hand. He ends up going to another realm and has to save "The House" from the rulers of each day of the week. Mister Monday is the first in the series which spand the seven days of the week. He has many great and exciting adventures. I enjoyed these seven books so much that I have read almost everything by Garth Nix.
Although Arthur Penhaligon is supposed to die an early death, he is saved by a key shaped like the minute hand of a clock, and now some bizarre creatures--including Mister Monday, his avenging messengers, and an army of dog-faced Fetchers--will stop at nothing to get the key back. Simultaneous.