Danny and Fiona ran through the halls of Casper High. Normally, this act would have gotten him stuck in detention, but Lancer merely smiled indulgently as they dashed by. That seemed very strange, but he was too late for rehearsals to do more than be grateful.

Dash had decided to practice his left hook and the boy's face, and Fiona had arrived just in time to rescue him. She was great that way. She had tried to convince Danny to just skip rehearsal, just this once since he was so late. He had declined on the grounds that Kat would kill him.

The auditorium was oddly quiet as they neared. They slid to a halt to let some band kids walk out and almost crashed into the director leaving as well. "Oh, hello, Dan," the man said in an irate voice.

"Was rehearsal cancelled?" Danny asked, perplexed. Kat should have been furiously bickering with the director, he thought. That's what she did last time he cancelled.

The director shrugged and shook his head. "Ms. Cadwell isn't here, and without an understudy, there's not a lot we can do without her. So the children voted to just go home."

"I bet I could play the part!" Fiona piped up.

The director smothered a laugh. At the girl's confused expression, Danny laughingly explained, "There's a good reason Kat doesn't have an understudy. We're all scared of her."

"Indeed," the director agreed. "And now if you'll excuse me…"

As the two teens walked back the way came, Fiona said thoughtfully, "She's not a very nice person, is she?"

Danny shrugged. "She's just Kat. She's kind of annoying, but she's really nice once you get to know her."

"She doesn't seem like it."

Oh, yeah, they had met. He forgot they hadn't like each other much. Come to think of it, he didn't used to like her, either. Now, why was that again? He rubbed his eyes; that train of thought gave him a headache. "Uh, listen," he muttered. "Why don't you go on home? I'm going to go make sure she's okay."

Fiona clapped her hands excitedly. "I know!" she exclaimed. "Why don't I go with you? I'd love to see where she lives!"

It occurred to Danny to wonder why his sister was suddenly so excited to see someone she didn't like, but that train of thought gave him a headache as well. Not to mention that it made him question her ulterior motives…"I don't think that's such a good idea," he answered, disturbed by the mistrustful turn his thoughts had taken.

"You're not going there alone!" his twin said forcefully, making him jump. Then the rage vanished and she smiled brightly. "That is…we're twins; we should everything together! I know you don't want to be alone anymore."

No, he d-

Wait. He wasn't alone. He had Sam and Tucker. And Jazz and his parents. He got lonely on occasion, sure, but Fiona…

He relented and simply decided not to go, but he couldn't help but wonder. Why did some part of him not want to trust her?

It was close to eleven at night. Danny had been lying awake for the past hour, thinking. Away from Fiona, that seemed easier to do. He knew he didn't trust her, but whenever he tried to think why, some stray thought distracted him. It was as though his own mind had suddenly turned against him.

And he was starting to worry about Kat again. Some part of him pointed out that Kat wasn't a nice person, and Fiona didn't like her. Another part reminded him that Kat was an acquired taste, that Sam and Tucker didn't like her much either, and that she seemed very sick last time he saw her. Against some part of his judgment, be it better or worse, he changed into Danny Phantom and flew to the cemetery. It seemed a good place to start looking.

Kat sat, leaning against and partially into her headstone. She looked wearily up at him and contrived to look perplexed. It didn't work very well. "Your light's flickering," she informed him weakly.

"Kat, what's happened to you?" Danny asked, kneeling down next to her. He reached out to put his hand on her shoulder and jerked back as she inadvertently started to drain his energy. As an electric ghost, she fed off power. If there was no power...

She flinched away from him, but a small part of her old spark seemed to return. "Sorry," she said, abashed. "I can't control it anymore. It's too dark."

Danny rubbed his hand. "This started when Fiona showed up," he muttered, finally catching onto to part of the thought that kept eluding him. A little louder, he went on. "But you keep defending her." Kat sighed, too tired to argue, but the boy didn't notice. Why did Kat defend his sister? It seemed important. Further, why had he not trusted her at first? Trying to remember was like wading through a swamp. It felt like the time the Ringmaster had hypnotized him into…

And just like that, Fiona's control broke.

"She's got you hypnotized," Danny said heatedly. "And me, too, but not anymore."

"No!" the object of his anger exclaimed. Unsurprised that she had followed him, he turned to face her. She stomped her foot. "No! No! No! You're my brother! And we're twins! And we're always together! You know that! I know you do!"

Danny shook his head, but rather than retort, he asked, "Why me? Of all people, why invade my life?"

"Isn't it obvious?" she answered snidely. "You're the one the master watches. You're the one she cares about, and the rest of the world can go rot."

"That's not true," Kat said, pulling herself to her feet. The effort clearly cost her, and she leaned heavily on the stone, but the bit of energy Danny had unwittingly donated finally enabled her to fight back. "Elegy's not like that. She gave you a chance, and you threw it in her face. It's your own fault she locked you up, so don't go taking it out on Phantom."

Danny turned, confused. "You know each other?"

Kat shook her head and slowly sank to the ground again. "It doesn't matter. Just stop her."

A flash of blue light drew the boy's attention back to Fiona, now in her ghost form. "I didn't want to get rid of you," she said as though it didn't really matter one way or the other. "But you've left me with no choice." She raised her arm and fired an ectoplasmic energy blast.

Mindful of Kat directly behind, Danny threw up his shield. As soon as the blast let up, he shot into the air and returned with one of his own. Fiona rolled out of the way before joining him in the sky.

Miles away, a black clad figure stood next to a black custom Harley-Davidson Sportster and watched the light show through a pair of binoculars. It was fascinating to see the two nearly identical ghosts weave and dive, alternately blasting at each other and brawling.

The silent watcher lowered her binoculars and patted the seat of the bike. "Not just yet, baby," she muttered. "We'll wait until he lets his guard down again before we strike. Let him get comfortable. Then we'll get our revenge, won't we, Sweetheart?"

The criminal known as Ebony Angel mounted her idling bike and sped away.

Danny dove below a blast of green ectoplasm, then shot forward to slam into Fiona. She cried out, as much in resentment as pain, and swung her foot around to kick her opponent in the head. Fighting with Skulker had well prepared him for a move like that. He caught her foot and swung her around, letting go after a moment so that she was thrown several dozen feet.

The interloper recovered quickly enough and balled her fists. "You can't do this to me!" she yelled. "This is my life! Mine!" With a wordless cry of rage, she charged forward.

Danny quickly slid the Fenton Thermos around and uncapped it, then pressed the button to activate it. "No, Fiona," he replied as his screaming opponent was pulled in. He snapped the lid back to ensure she wouldn't escape. "It's mine."

He dove back to the ground to make sure Kat was all right now and to ask her advice on what to do with his prisoner. With the dark haired woman apparently dead…

The woman called Elegy was staring down at Kat's grave, but she looked up as he approached. "She's fine," she called to him. "Or she will be after she pulls herself back together."

Danny landed and went human again, his face a portrait of incredulity. "I thought Fiona killed you."

Elegy shook her head and gave a short breathy laugh. "No, she just…well, that's not important. Um, could you do me a favor?" She waited while Danny considered that and finally nodded cautiously. "It's just…don't talk to Kat about this. She might remember Fiona, but she won't remember knowing her or me."

"Why not?"

"That's not important either." She held out her hand; after a moment's hesitation, Danny relinquished the Fenton Thermos. She smiled. "I…um…uh…" She made a noise of disgust and cleared her throat. "Sorry. I guess I didn't need to worry about you, after all. Bye, Danny. We won't meet again."

She turned around, took a few steps, and faded away. Danny raised an eyebrow; just before she vanished, he could have sworn he heard her mutter, "Theoretically."