Stop by this room for more bullets and health. Don't get surprised by the guard behind the wardrobe.

Put an end to these sub mutants when you get here.

Find more ammo at this end, beware the armour, there is a bomb behind it. Do away with the ghost in the bathroom to the south for more health.

Tour the inner section of the floor through the dark brown, cyan and magenta rooms. Clean them out.

In the part of the floor you have now covered you will find three crosses...

...one in behind the fireplace in this room...

...and two in this secret room.

Make sure you take one cross at a time AND make sure you use one of them for THIS death chalice. (After having finished with the ghost.)

Continue.