Thief Side Mission: Slick Willy

When you enter Willy's townhouse, you're on the upper level. There's not much to loot here, but there is more downstairs. Before heading down, examine the picture of the naked woman on the wall. Find the hidden switches, and a secrete panel opens. A dead Willy falls from the ceiling, and has an item to grab on him.

Head downstairs, and loot everything. Climb up the ladder inside the secret area, and head up. Open the chest, and grab the watch (as well as the coins). When you see the mission complete prompt, you're done.