school in New York. Iâd been hoping to see her more often. It was a boarding school in Brooklyn, and she and Thalia were both attending, close enough to Camp Half-Blood that Chiron could help if they got in any trouble. Because it was an all-girls school, and I was going to MS-54 in Manhattan, I hardly ever saw them.
âYeah, uh, cool,â I said. âSo youâre staying there the rest of the year, huh?â
Her face got dark. âWell, maybe, if I donâtââ
âHey!â Thalia called to us. She was slow dancing with Grover, who was tripping all over himself, kicking Thalia in the shins, and looking like he wanted to die. At least his feet were fake. Unlike me, he had an excuse for being clumsy.
âDance, you guys!â Thalia ordered. âYou look stupid just standing there.â
I looked nervously at Annabeth, then at the groups of girls who were roaming the gym.
âWell?â Annabeth said.
âUm, who should I ask?â
She punched me in the gut. â Me , Seaweed Brain.â
âOh. Oh, right.â
So we went onto the dance floor, and I looked over to see how Thalia and Grover were doing things. I put one hand on Annabethâs hip, and she clasped my other hand like she was about to judo throw me.
âIâm not going to bite,â she told me. âHonestly, Percy. Donât you guys have dances at your school?â
I didnât answer. The truth was we did. But Iâd never, like, actually danced at one. I was usually one of the guys playing basketball in the corner.
We shuffled around for a few minutes. I tried to concentrate on little things, like the crepe-paper streamers and the punch bowlâanything but the fact that Annabeth was taller than me, and my hands were sweaty and probably gross, and I kept stepping on her toes.
âWhat were you saying earlier?â I asked. âAre you having trouble at school or something?â
She pursed her lips. âItâs not that. Itâs my dad.â
âUh-oh.â I knew Annabeth had a rocky relationship with her father. âI thought it was getting better with you two. Is it your stepmom again?â
Annabeth sighed. âHe decided to move. Just when I was getting settled in New York, he took this stupid new job researching for a World War I book. In San Francisco .â
She said this the same way she might say Fields of Punishment or Hadesâs gym shorts .
âSo he wants you to move out there with him?â I asked.
âTo the other side of the country,â she said miserably. âAnd half-bloods canât live in San Francisco. He should know that.â
âWhat? Why not?â
Annabeth rolled her eyes. Maybe she thought I was kidding. âYou know. Itâs right there .â
âOh,â I said. I had no idea what she was talking about, but I didnât want to sound stupid. âSo . . . youâll go back to living at camp or what?â
âItâs more serious than that, Percy. I . . . I probably should tell you something.â
Suddenly she froze. âTheyâre gone.â
âWhat?â
I followed her gaze. The bleachers. The two half-blood kids, Bianca and Nico, were no longer there. The door next to the bleachers was wide open. Dr. Thorn was nowhere in sight.
âWe have to get Thalia and Grover!â Annabeth looked around frantically. âOh, whereâd they dance off to? Come on!â
She ran through the crowd. I was about to follow when a mob of girls got in my way. I maneuvered around them to avoid getting the ribbon-and-lipstick treatment, and by the time I was free, Annabeth had disappeared. I turned a full circle, looking for her or Thalia and Grover. Instead, I saw something that chilled my blood.
About fifty feet away, lying on the gym floor, was a floppy green cap just like the one Bianca di Angelo had been wearing. Near it were a few scattered trading cards. Then I caught a glimpse of