Push the button to open the door. What do you know? Another room.
Same as before, go up the stairs, and soot the glass. Take the big arrow - Sundial Gnomon.
Go downstairs. To open the locked door, simply press "use" (the E key) on the flashing red light. It should turn green. Just open the door and you're out.
Continue down the hallway and exit the door, into the main living room. Next on our list is the grappling hook. It's well hidden in the garden. To get there use the door with the stairs, form the living room.
Go down the stairs after the door and then run on the hallway until you reach the gardens.
On the giant clock in the middle, use the giant arrow you found earlier. Then you'll have to rotate the main clock in the direction of a real clock slowly until the hours 11 and 2 rise up, and when you get to 6 a light shines down on it. Now the gates will open, and you're a little closer to the grappling hook!
To get in the center of the garden, you'll have to negotiate the maze. Luckily you've got the map. (Told you you'd need it J)
Make your way through the maze to the exact opposite side of the gate, and enter the center area.
Take the grappling hook.
Use the grappling hook on the gates ("Q" key) and then pull ("E" key). To release press "Q" again.
Do the same thing you did to the gate on the panel in front of the statue. (Grab and pull with the grappling hook)
Return to the living room. Lucky the gates are open, huh?