A/N: So, saying this update has been delayed is a massive understatement. Life kinda fell apart for a while, but things are sorting themselves out. You may want to re-read the previous three parts of this, just to refresh your minds. Read, review and (hopefully) enjoy.

Chapter Four.

Tamsin and Dyson were at Lauren's clinic waiting for her to finish the autopsy on the dead guy who was found outside the Dal. The Valkyrie was replaying it over and over in her head, he was still warm when they found him, like he had been killed in the previous 20 minutes or so before they found him. Her heart was wanting her to believe it couldn't have been Bo, they'd all been here before with the Dark Fae that Bo had nearly drained outside the Dal, but this was different. The last time had been in the lead up to her Dawning, her body was going through changes she didn't understand, nor could she control. That had been why Tamsin had lied to Evony, though she knew that the leader of the Dark Fae hadn't believed her, she did it because she knew that Bo would never willingly do something like that. Since that time she had, of course, got to know Bo a lot better. Bo had told her about the years she had spent constantly on the move, not knowing who or what she was, killing because she couldn't control it. But since she had found out who she was, she hadn't killed anyone. Obviously because there was no lack of willing partners, Tamsin herself being one of them on more than one occasion. As usual when it came to the Succubus Tamsin's head and heart were in conflict. In her head she knew it was possible, with a Succubus it was always possible, but Bo wasn't just another Succubus.

She kept thinking back to the changes that she noticed in Bo's eyes, the blue tinge that was developing around the pupil in her eyes, like the Succubus was gradually starting to take over. That change could've been explained by a very recent feed, and to drain someone so completely, Tamsin wasn't sure if that would explain it. Deep down she also knew that the change could be brought on by the time that Bo was spending with her father. There was, of course, a reason that he had been hunting for Bo for all those years. Her power was unimaginable. If Hades had chosen to have a daughter with a normal Succubus, she would've been powerful, but Aife was far from normal. She was the daughter of the Blood King, the man who could change anything he wanted by writing it in his book in his blood. Tamsin knew first-hand the power of his blood, it had granted her an extra 7 lives. Combining that power with all the power of the underworld. She hated to think about just what Bo could be capable of if they fully removed all traces of her humanity. Kenzi had told her the story of Bo draining an entire room of people when Lauren's life was threatened, and she'd been in the city after Bo's Dawning when she had drawn the Chi from Trick, Stella, Kenzi and Lauren to save Dyson, not killing them, but taking just what she needed to bring the Wolf man back into the land of the living.

She was snapped out of her thoughts as Dyson began pacing the room.

"You trying to wear a hole in the floor?" she asked as she leant against the cabinet near the door which Lauren was in.

"Do you think she could've done it?" he asked in reply.

"It wouldn't be the first time…" Tamsin replied, furrowing her brow a little, "but there was a reason for the last time… do I think that Bo could drain the life out of someone if something else wasn't controlling her and forcing her to do it? I… don't know any more D…"

Dyson was a little shocked by the bluntness of Tamsin's answer, he knew what she was getting at though.

"There is, of course another explanation for all this," the Valkyrie continued, "we know Aife is in town…"

"I've had my sources out there, trying to find her," Dyson replied, "she hasn't been seen since she stopped by here the other night. I don't think she'd feed from someone outside the Dal without coming inside…"

"I don't know," Tamsin said with a sigh, "it's not like her and Trick have the best relationship, and she knows what Hades is capable of…"

The door opened and Lauren walked out, Tamsin could tell from the pale look on her face that she didn't like what she had found.

"So…?" Dyson asked.

"You were right," Lauren replied, "it was a Succubus kill…"

"It could be Aife." Dyson said, refusing to believe that Bo would've done it, "why would Bo drain someone, if she was hungry… I mean, I was there, Tamsin was there… why would she do that…"

"Because she can…" Tamsin replied, giving them the answer that none of them wanted to consider, "since her father got here she's been… different. The other night when she was here, and Lauren asked her which side she would've chosen if she could go back… she said Dark. Later that night I saw her at the Dal and she was talking about how she and her father aren't really that different, how she's been hiding the person she really is… I…"

"No," Lauren said, shaking her head, "we know Bo, we know that she would never do this if there wasn't a reason for it."

"There is a reason," Tamsin said, "the power… her father is the only person I've ever met who scares me. There's a reason that he was trapped in Tartarus, and it's not because he spreads sunshine and puppies…"

"Who trapped him in the first place?" Dyson asked.

"Freya…" Tamsin replied, "They… have an agreement. Souls which are not meant for Valhalla get sent to him. He feeds off the fear, it makes him stronger."

Tamsin leant back against the cabinet again, crossing her arms over her chest and focusing her eyes on a point on the floor.

"In your diary, you mentioned going to Tartarus," Lauren said, recalling what Dyson had read from the Valkyrie's diary, "what was it like?"

Tamsin shook her head.

"Now isn't the time to hold all this inside Tamsin," Lauren said, her anger starting to grow inside her, "we need to know."

"And you know I can't tell you." Tamsin replied, her eyes snapping up from the floor to look at Lauren, "I wish I could, but I can't."

"I know… I'm sorry, I just…" Lauren started to say.

"We're all scared Lauren," Tamsin said, "If she did this… none of us want to lose her, not like this…"