The story so far. Father Nathanael has followed a woman home from Club Inferno, using his powers of Obfuscate to shadow her invisibly. He is now inside her apartment. See "Cloak and Dagger" on the Requiem forum for details.
Nathanael doesn't find any children in the apartment. He does find kids' rooms, but no kids asleep in their beds. It would seem she made plans for them to stay overnight with her mother while she spent the night partying.
Nathanael hears a shower running.
Looking around, he finds multiple pictures of this woman - Gwen - with two children, a boy and a girl. He also finds one bedroom door - presumably Gwens - closed.