There are quite a few things you need to do to get out. Not knowing exactly how far you are, here's all the steps through the hideout.
Once you've climbed in the window, keep clicking at the side of Nicole’s feet to move her over to the left side of the boxes near the door. Open the PDA and select the camera icon to take a picture of the bag on the bed. Select the photo album on the PDA to see a picture of the bag containing the note. The note is upside-down, and the selection of numbers after the 555 is random each time. Select the phone from the PDA, enter the number from the note and then select the phone icon to call the thug: He will leave the room to answer his phone. Go through the doorway to the next room.
Open the wardrobe at the right side of the room and examine the back of the closet to reveal a hidden passage. Go through the passage to enter the hidden room: The game will automatically save the game here. Examine the chest of drawers and open the second drawer from the top. Take the ritual dagger from the drawer to be caught by the thugs.
Save the game at this point. The aim now is to cross to the top-left corner of the room by moving on the correct tiles. You are only allowed to make two mistakes before the game must be restored and the puzzle is also timed, so be sure to move quickly. Move back twice, left once, back once, left twice, forward once, left once, forward four times, right four times, forward twice, left twice, forward twice, left once and forward twice:
Open the wardrobe and go through to the hidden room again. Examine the chest of drawers. Use the luminol, the lamp and the gloves on the ritual dagger to take it. Exit the view of the chest of drawers. Move the top-left carpet corner to reveal a trapdoor. Try to open the trapdoor: It is jammed. Examine the second painting from the left on the wall and then move the painting to see a hidden lever. Move the lever and then exit the view of the painting. Open the trapdoor and go down to the storage room.
Hope this helps!