Go through the Stowage Deck - map | Chapter 8: The Dawn's Light
Key points of Thief - The Dawn's Light 2
Starting point – Garrett will begin here the exploration of the second part of the ship.
Ropes – Garrett can grab the first rope here and he also use a rope arrow in order to gain access to the upper southern balconies.
Hole – Reaching this hole is possible if you've used the upper balconies and dropping down will allow you to reach the exit without having to deal with nearby enemies.
Main door – Using this door is one of the methods of reaching Orion and Erin, however this passageway is guarded by three enemies.
Door – Reaching this door will allow you to use the staircase leading to level 2 and to avoid the enemies guarding the main entrance.
Box – Box used to disable a trap connected with the southern door.
Exit – Door leading to an area with Erin and Orion.
Map above shows three more decks of The Dawn's Light through which your character has to walk to find Orion and Erin. As usually, there is several possible ways (two worth considering, the third one not) and they are marked on the map. More detailed description of the journey at the next page of the guide.