Enter the south eastern cottage.

Find this cross in the living room/dining room.

In the bedroom don't get surprised by the guard behind the wardrobe.

Go through here and get the cross in the veranda for full treasure quota. (To get that you must of course also find all the health chalices.)

Go back to the living room/dining room and take the first death chalice.

Locate this secret door and fight your way to...

...this room for another cross.

Go through here and find the gold key in the veranda.

Continue.