Walk over to the broken trolley with the wheel that is in good shape. You should have a metal stick in you inventory. Use the metal stick on the wheel to remove it. Go over to the trolley in good shape and used the fix wheel on it. Push the now working trolley against the wall. Combine the stretcher in your inventory and place it on top of the trolley. Combine the hammer with another piece of metal in your inventory and use it on the stretcher. You now have a makeshift ladder. Climb up the ladder and enter the window. (By the way, if you search around the area you will find make up tools and certain chemicals.)
Examine the room. There are a few posters which you must take advertising for an amazing spiritualist. There are also glass eyes. Strangely enough, there is also a corpse laid out on the table. Several notes explain the use of corpses in the spiritualist’s seances. Look at the tag of the body and see that it says London Hospital. You will also find a picture of a woman who died ten years earlier. The body on the table has been made to look like her. Get the note explaining the call sign used by the employees of this spiritualist. Note that there are makeup tools here as well. It doesn’t take a Sherlock Holmes to conclude that a charlatan is using people’s gullibility to convince them of his amazing powers.
Look at the box on the shelf. It is a number puzzle. The object of the puzzle is to remove all the blocks. They must add or subtract to equal the red number in the large box. When you remove all the blocks, you will get a square item, a triangular item. Combine these items and look around the room to find the red ribbon. When you get it, combine the red ribbon to make the necessary pendant.
Holmes says that he hears someone coming. Select the pendant from the inventory and walk outside. You have confirmed that there is a market for corpses in London, but you do not know yet whether or not there is a market for organs. Chat with them now that you have the sign and find out that they move the bodies during the seances. (This information does come into play later.) There is not much more you can do here, but you have eliminated organ trafficking as a possible suspect for the recent rash of murders.