Suicide or at least a murder made to look like it. I also can't eliminate the possibility that she was coerced. But in terms of motive...

[ Always a possibility; he should know with his own history of forcing others to commit suicide in horrifying ways. A police man, a Vice Minister of Justice's secretary. These are personas that Gogol has adopted to suit a purpose in the past.

So is it a mask when Gogol gently places the body's arm back into the water. Or it is merely a rare moment where his maskless face reflects how he's acting. All his attention flips from the corpse to searching the youth's face for a shred of emotion with a look over his shoulder. ]

What was her relation to you?