The lock picking tools are one time use only and will disappear in the inventory after being used. The choice is whether to use it on room 507 or Hellouin's office.

Hellouin's office - Go to the end of the hall and look at lock-doorknob of last door.

Lock picking puzzle: There are 5 picks but the middle one is not used. The keyhole has 4 places to insert the picks. The picks can be moved up-down or left-right. The correct pick at correct place is seen when the door knob is clicked and the pick stays still. To know which pick is what, place the hand icon on lock pick's bright brown pack - the pick in the lock will light up at its original position in the pack.

Place 4 picks except the middle one in the keyhole. Click door knob. Click each shaky pick to move them (up down, left, right) and then click the door knob. If the pick shakes wildly, it is in the wrong place, if the pick shakes slightly, it is in the right place but wrong position. If the click stays still, it is placed correctly.

Turn right and look close at fireplace. Take the ring of Fay. Go to bottom of bed and take slivers of glass with purple powder. Look close at drawer by the bed and take the key to strongbox.

Hotel Orphee - Take the pencil from the reception desk. Talk to Petit and to Nicholas, the barman for more info. They both talk about Malet. Go up. Talk to Mrs. Loiseau about everything and learn about the BSORC and K. She might give you a magic talisman if you didn't get the pencil.

Room 505 - Go to locked door, place newspaper under the door and use the pencil (or a magic talisman given by Mrs. Loiseau) on the keyhole. Use the key on keyhole and get a psychic vision!

Room 507 - Turn right and look close at fireplace. Take the ring of Fay. Go to bottom of bed and take slivers of glass with purple powder. Look close at drawer by the bed and take the key to strongbox. Go to the bathroom and see black dye on sink. (Isn't her hair red?)