"Do you mind if I take a look around your house?" 

Petra stares at her for a long moment before shaking their head.

Go ahead.

She looks carefully, making a ball of magical light almost as an afterthought - primarily scanning the floor for any signs of claw-marks or remnants of blood, focusing around the entrances.

No blood or claw marks anywhere.

"You haven't been here long, but is there anyone who could speak to your character?" 

Petra spells out the name: Julitta Salvarus.

I've known her since I was a child. My sister did business with the family.

"Thank you. If you don't have any questions for me, I can go talk to her, then."

Are you Ena's younger sibling?

She nods. "You know her?"

I've heard of her. Seen her around the city. Do you work together too?

"No. Actually hadn't seen her in years, until coming here."

Petra nods.

Good luck. I hope you find whoever is doing this. I will be here.

"Thank you. Hopefully this'll all be resolved soon." If Petra has nothing further to sign, she says goodbye and lets herself out.

The Guard-Captain follows her out.

"Anything useful?"

"I'll be talking to a friend of hers, Julitta Salvarus, for character references at some point. Petra doesn't strike me as the type to half-win a fight with a werewolf, or to not seek healing if bitten, but you never know. There wasn't any sign that she'd ever turned inside her house - from what I've seen, the first transformation is usually a surprise."

She keeps to herself the way Petra had signed Julitta's name a bit emphatically - that could be anything, and Petra might just want her name cleared sooner.

"I'd like to go ahead and finish everything with Petra before moving down the list, so do you know where this Julitta lives? Or anything about her?"

"Old Falkreath family. Mostly Imperials. They distribute alchemical ingredients, wolfsbane mainly."

Unfortunately she doesn't know enough about botany to remember if that's strange. Though she's not aware of many uses for wolfsbane beyond poisoning werewolves.

"Lead the way, then."

He leads and takes her to what seems like one of the nicer and larger homes in the city.

She knocks on the door.

It takes a while but eventually, a small redguard woman opens the door. Her hands and bits of her face seem to be covered in black charcoal. She blinks at them.

"Hey, sorry, I was upstairs.. wasn't expecting anyone."

"It's okay. We'd like to talk to Julitta Salvarus, about an old friend of hers, Petra, if now's a good time."

"That's me, but uh, the name Petra isn't ringing any bells..."

"Petra the Withdrawn? Mute dunmer, said they'd known you as a child?"

"Oh! Yes, I know them. Never really had much to do with them though. I think they had a sister? She mostly dealt with my uncles. Who aren't here."

"Ah. Do you know them enough to speak to their character? Or would your uncles?"