The following is a list of all the clues and/or objectives you need to complete in order to get the best possible detective ranking at the end of the game:

PERSON BEFRIENDED
* Celie (get her necklace from the doghouse [throw the bone to the dog] and give
it back to her, from 9:00)

TOOK FOOD ITEM FROM
* Kitchen (bone in the icebox)
* Celie's Cabin (get the carrot, after you've befriended her)
* Jeeves' room (crackers beside J's bed. Room can be accessed first at 8:15)

TOOK USEFUL ITEM FROM BODY OF
(always type "search body" when you find one)
* Lillian
* Clarence
* Wilbur (VERY important item)

PEOPLE FOUND MURDERED
(when you notice there's been a murder somewhere, you've got to find the body
before the clock strikes the next quarter)
* Gertie (in the garden, near her bedroom)
* Wilbur (often in the chapel)
* Gloria (in the gazebo or in the well)
* Ethel (often in the rose garden)
* Fifi & Jeeves (in Fifi's room)
* Clarence (often in the bathroom. Look for the body before reading his diary)
* Lillian (Hedge Garden)

FOUND SECRET ENTRANCE/EXIT IN
* The hallways (pull the armoires, the mirror...)
* Hedge garden (use the valve handle on the base of the statue. You will need a
lit lamp to go down there [the lamp can be taken after having given a carrot to
Blaze, the matches are on Clarence's body]. I advise you to explore this passage
as soon as you get the matches, otherwise you will come too late to save the
Colonel)
* Basement (use the crank to go further in the secret passage)

OBJECTS USED MORE THAN ONCE
* Crackers (give one to Polly every hour)
* Oilcan (oil the armor's helmet and the bell)
* Lillian's Diary (read it, then examine it with the monocle. It's in L's
suitcase at 1:00)
* Monocle (found on Wilbur's body, useful to examine many objects)
* Crowbar (to remove the floorboards in the chapel and to force Ruby's plate in
the Crouton's Crypt)

TOOK OBJECT FROM SUITCASE OF
* Lillian (at 1:00)

VALUABLE OBJECT TAKEN
* Jewels (that's the reward for solving the Sarah Crouton mystery)

RELIGIOUS ARTICLE DISCOVERED
* Bible (remove the floorboards near the pulpit with the crowbar. That's how
begins all the Sarah Crouton story)

ITEMS REQUIRING CLOSE SCRUTINITY
(i.e : type "look at with monocle")
* Bootprint in mud (in the billiard room at 10:00)
* Sleeping powder bottle (in the bathroom basket, at 12:00)
* Broken record (in the game room...