"Well then, I'll start by creating some hypothesises. As a scientist, investigation and experimentation are my prime skills. The three thugs mentioned that this person turned one of your officers into a 'water-zombie', so to speak. If he wants to reside nearby the city, he would obviously set up his base of operations in or around the local waters. I would suggest beginning a search of the water pipes that are in the city. If that's not where he is, then we search in the next biggest source of water."