Even Worse-Smelling than Normal

After optionally speaking to Bart and gathering almost no useful information from the rock troll (aside from the fact it heard a hissing noise from the wall while it was taking a “turdy dump”), begin your Witcher Sense inspection of the scenery:

• The blast in the wall indicates it was blown open from the inside. The bathhouse drain pipes converge at this point.
• Step through the blasted wall into the sewer tunnel and search the initial chamber. There is a grate, and bits of pipe clear across the chamber—it was a powerful blast. Perhaps a bomb, and not a spell? The objective updates when you find both these clues.

Now head to the open grating (east), and take one of the Pops’ Mold Antidotes to continue.

• There are three pipe gratings on the outside curve of the tunnel (to your right).

Further down the tunnel, prepare to slice apart a drowner lurking in the poison mists. Close by is an easily-overlooked emerald ring. Evidence that the thieves used this tunnel to escape. Continue down the tunnel to a connecting chamber. Slice two more drowners apart, then examine a corpse. This is Fonce, the thug Dijkstra hired. Follow the current and tackle two more drowners ahead.

Continue through an open gate into a large, wooden-walled storage chamber with a couple more drowners, and steps up to a balcony. There’s no need to ascend. Check the iron gate to the west (along the sewer current) to find part of a silver cylinder with runes etched into it. A bomb part? Just beyond the gate is an exit to the canals of Novigrad (where the thieves probably loaded their loot onto a barge).

Your objective updates; retrace your steps through the poison mist, back into the cellars and pass Bart, then climb the ladder up into the columned bathhouse room. Now, maneuver your way through the bathhouse to Dijkstra’s library office.

Tell him you’re done investigating. You show him the bomb fragments, and inform him of the ingredients you smelled. Answer however you wish. After some talk about chemical reactions and sugar, tell him the bomb was found inside the pipe, and in pieces. You both deduce someone flushed the bomb down from a bathhouse pool inside this building. Use your Witcher Senses to uncover the following:

• There is a film of oil on top of one of the pools, southeast of your starting location. On the pool step opposite the oil is a silver lid matching the cylinder base you found. You summon Dijkstra.

Dijkstra tells Happen (his eunuch) to drain the pool. Ask about Happen’s loyalty if you wish (it is beyond question), then inspect the pool. The grate has been removed. Happen rattles off the names of those who used the pool on the day of the explosion: Margrave Henckel? Impossible! He’s been dead a year! Time to search his home, and pronto!