Arthur Penhaligon is an ordinary boy whose life changes when he has a near-fatal asthma attack while running during PE. Just as he is about to lose consciousness he is given a key by a mysterious man. The man, Mr. Monday, has determined that Arthur is about to die, but with the benefits of modern medicine and his inhaler, Arthur survives and sets off an adventure quest to search for 7 keys of a mysterious house. Each quest involves battling 7 Morrow Days who are the trustees of the house and represent the 7 Deadly Sins. Grim Tuesday is the 2nd book in the series (Mister Monday is the first), and in this book Arthur's adventure takes him to the Far Reaches of the house where he must face Grim Tuesday who is afflicted by Greed. I had listened to Mr. Monday many years ago but have started the series over in audio with my 13-year old son... and loving it. Very well narrated and incredibly clever.