The Sea of Monsters

door.
    “Late as usual,” she said.
    She was holding her cat, Muffin, who’d been a “going away” gift from Dad six years before. Muffin never seemed to get older or bigger. She had fuzzy yellow-and-black fur like a miniature leopard, alert yellow eyes, and pointy ears that were too tall for her head. A silver Egyptian pendant dangled from her collar. She didn’t look anything like a muffin, but Sadie had been little when she named her, so I guess you have to cut her some slack.
    Sadie hadn’t changed much either since last summer.
    [As I’m recording this, she’s standing next to me, glaring, so I guess I’d better be careful how I describe her.]
    You would never guess she’s my sister. First of all, she’d been living in England so long, she has a British accent. Second, she takes after our mom, who was white, so Sadie’s skin is much lighter than mine. She has straight caramel-colored hair, not exactly blond but not brown, which she usually dyes with streaks of bright colors. That day it had red streaks down the left side. Her eyes are blue. I’m serious. Blue eyes, just like our mom’s. She’s only twelve, but she’s exactly as tall as me, which is really annoying. She was chewing gum as usual, dressed for her day out with Dad in battered jeans, a leather jacket, and combat boots, like she was going to a concert and was hoping to stomp on some people. She had headphones dangling around her neck in case we bored her.
    [Okay, she didn’t hit me, so I guess I did an okay job of describing her.]
    “Our plane was late,” I told her.
    She popped a bubble, rubbed Muffin’s head, and tossed the cat inside. “Gran, going out!”
    From somewhere in the house, Grandma Faust muttered something I couldn’t make out, probably “Don’t let them in!”
    Sadie closed the door and regarded me as if I were a dead mouse her cat had just dragged in. “So, here you are again.”
    “Yep.”
    “Come on, then.” She sighed. “Let’s get on with it.”
    That’s the way she was. No “Hi, how you been the last six months? So glad to see you!” or anything. But that was okay with me. When you only see each other twice a year, it’s like you’re distant cousins rather than siblings. We had absolutely nothing in common except our parents.
    We trudged down the steps. I was thinking how she smelled like a combination of old people’s house and bubble gum when she stopped so abruptly, I ran into her.
    “Who’s that?” she asked.
    I’d almost forgotten about the dude in the trench coat. He and my dad were standing across the street next to the big tree, having what looked like a serious argument. Dad’s back was turned so I couldn’t see his face, but he gestured with his hands like he does when he’s agitated. The other guy scowled and shook his head.
    “Dunno,” I said. “He was there when we pulled up.”
    “He looks familiar.” Sadie frowned like she was trying to remember. “Come on.”
    “Dad wants us to wait in the cab,” I said, even though I knew it was no use. Sadie was already on the move.
    Instead of going straight across the street, she dashed up the sidewalk for half a block, ducking behind cars, then crossed to the opposite side and crouched under a low stone wall. She started sneaking toward our dad. I didn’t have much choice but to follow her example, but it made me feel kind of stupid.
    “Six years in England,” I muttered, “and she thinks she’s James Bond.”
    Sadie swatted me without looking back and kept creeping forward.
    A couple more steps and we were right behind the big dead tree. I could hear my dad on the other side, saying, “—have to, Amos. You know it’s the right thing.”
    “No,” said the other man, who must’ve been Amos. His voice was deep and even—very insistent. His accent was American. “If I don’t stop you, Julius, they will. The Per Ankh is shadowing you.”
    Sadie turned to me and mouthed the words “Per what ?”
    I shook my head, just as mystified. “Let’s get out of here,” I whispered, because I figured we’d be spotted any minute and get in serious trouble. Sadie, of course, ignored me.
    “They don’t know my plan,” my father was saying. “By the time they figure it out—”
    “And the children?” Amos asked. The hairs stood up on the back of my neck. “What about them?”
    “I’ve made arrangements to protect them,” my dad said. “Besides, if I don’t do this, we’re all in danger. Now, back off.”
    “I