Amy tilted the bottle back, letting the slimy liquid run down her throat. She didn't care what happened to her, just as long as she had a chance. A chance to save Dan. A chance to save herself. A chance to save the world. A chance to . . . love Ian.

The mixture tasted nasty. Amy could taste the honey, but everything else was a foreign mixture. It was spicy and metallic, like licking a pool ladder.

Amy shuddered as the last drop slid down her throat.

She looked up at Ian. "Has anything happened to you yet?" She asked.

Ian shook his head. "I took mine two seconds before you did."

Amy swallowed, trying to get the taste of the serum out of her mouth. "Ian." She shuddered. "I'm scared."

Ian nodded. "Me too."

They said nothing, just sat on the floor, breathing, waiting for something to happen.

Exactly ten minutes later, Ian choked on the breath of air he was inhaling. He screamed and began flailing on the floor.

Amy's eyes widened and she stepped out of the way of Ian's booted foot as it swung wildly towards her.

Part of her wanted to laugh at the hot rich Brit rolling around on the floor. But the other part of her screamed, "That will be me next!"

Exactly two minutes after Ian started, Amy felt her throat and chest constrict. She grabbed wildly at her chest and neck, clawing, trying to ease the pain.

She felt herself rolling, but with every movement the pain grew until it was a horrible monster that threatened to knock her out.

She welcomed the blackness and reached for it, her hand shaking. But it wouldn't come. The dark was right in front of her eyes but no matter how far she reached she couldn't get it.

And then it stopped. Amy sat up. Ian sat staring at her. "Is that what I looked like?" He asked.

Amy nodded, embarrassed. "That hurt." She said.

And the she gasped. "Ian? Are you breathing right now?" Even while she spoke she felt no puff of air come out of her mouth. Her voice sounded the same, not like the time she'd held her breath for two minutes.

Ian placed his hand over his nose and mouth. His eyes traveled up to meet hers. "No." He said.

"So it works." Amy said. "We're invincible. No one can drown us."

Ian frowned. "We can't be. It's impossible."

Amy glanced around the tiny cabin, hoping she would find what she was looking for. She spotted a shard of glass lying on the floor near the window and jumped to it. "Let's see." She said.

Gripping the glass in one hand, she drew the sharp point over her skin. Ian jumped. "Amy, no!"

Amy's eyes widened, partly from terror, and partly from astonishment. Blood, which had before been running out of the wound, traveled backwards into it. They stared in astonishment as the skin pulled itself back together, visibly knitting the ends together.

After about thirty seconds, Amy's arm looked the same as it had before.

"Give me that!" Ian said, snatching the glass and running it over his arm. The same thing happened.

Amy looked up to meet Ian's eyes as realization dawned. "We could jump off the Eiffel Tower and land on our heads and it would fix itself." She said.

"Whatever you took." Dan said, shocking both of them as they looked up to see him standing over them. "Give it to me."

Amy and Ian jumped up from their crouch on the floor. "How'd you . . ." Ian said.

"You were sleeping!" Amy said.

Dan snorted. "Like I'm not going to notice both of moaning and thrashing about like you're zombies awakening from the dead."

Amy and Ian glanced at each sheepishly. If they had known the results, they would have done it in a different room.

"Give me some." Dan said.

"No." Amy and Ian said.

"Or I'll tell Nellie . . ." Dan threatened.

Ian shook his head. "No."

"We will! We will!" Amy said.

"What's so bad about Nellie finding out?" Ian asked.

Amy shuddered. "Remember the paint glue, Dan?"

"Paint . . . glue?" Ian asked.

Dan smirked. "How could I ever forget."

"What was the paint glue?" Ian asked.

Amy blushed. "Nothing."

"I'll tell Nellie myself if you don't tell me!" Ian said.

Amy sighed. "Ok . . . so, I was repainting our apartment, this was right after Nellie had got hired, and Dan decided to play a prank. It was white paint, so he put glue in it. Lots and lots of glue."

Ian groaned. "Why am I not surprised? Your stupidity, Dan, will always be counted on."

Amy rolled her eyes. "And then Nellie walks into the room right as I figure out what he did, mostly because the paintbrush wouldn't come off the wall."

Ian snorted.

Dan frowned. "Do I get some now?"

Amy looked at Ian. "Why not." She said.

Just then, Natalie came bouncing into the room. "Hey, guys." She said. "What's up?"

"They took the serum." Dan blurted. "Without us."

"What?" Natalie yelled. "Why?"

Nellie walked into the room. "What are you guys talking about?" She asked, glaring at all of them suspiciuosly.

"We were just about the paint glue. Remember that?" Amy asked.

Nellie groaned. "How could I forget?" She looked at the Kabras. "I'm sure they told you the story, but here's my version. So here I am, sitting on the couch, minding my own beeswax and eating the most amazing chocolate filled croissant ever, when all of a sudden I hear this shriek. So I'm like, 'hmm, maybe Amy's beating up on Dan.' Boy was I wrong. So I like, get up and go in there, and like, Amy's trying to pull this paintbrush off the wall, but it's like, stuck, like, with glue. And Dan's in the corner laughing his butt off and I'm like 'what the heck guys, don't you know how to behave?' And Amy's like 'my brush is stuck to the wall' and I'm like 'no duh'." Nellie paused, taking in a huge breath.

"And then you started yelling." Amy said.

Dan smirked. "And then Miss Crybaby over here started sobbing."

Nellie snorted. "And then I was like, 'what the heck, Amy, you're fourteen, act like it.'." Nelli shook her head. "I could deal with the clue hunt, the running away, the disapapearing for long hours, the murderous relatives, the betraying relatives, the heartbreaking relatives," She cast the Kabras a dirty with each phrase, "But not the fourteen year old sobbing like she's two."

Amy sighed. "Well, what I was supposed to do. I knew you'd get mad at me, and, what was our au pair before that, Dan? Gertel, Gretel?"

"Gretel." Dan said. "If we made an ounce of noise she yelled, and it scared Amy."

"She said bad words." Amy said.

Dan snorted. "Like I didn't use them already."

Natalie rolled her eyes. "It's different when they're being yelled at you. It's like if you're saying, 'What the fuck, that did not just happen', to your bookshelf, but if your au pair is yelling 'What the fuck did you do here!'."

Amy nodded. "Exactly."

Nellie stretched lazily. "Where do you guys want to go tomorrow, back to England?"

The four exchanged glances. "No." Ian said.

"We want to stay one more day and see what we can figure out." Amy said.

Natalie folded her hands neatly and smiled up at Nellie. "Please?"

Nellie sighed. "Teach Amy and Dan manners like that and you got yourself a deal." She grabbed her purse and pulled out a granola bar. "I'm going to go sit on the ground."

Natalie blinked. "Why?"

"Because there's no water on it, duh." Nellie walked out of the plane and plunked down outside the cabin.

Amy looked at Dan. "She thinks we're up to something."

Dan frowned. "And I'll confirm her suspicions if you don't give me and Natalie some of that serum, now."