The Mark of Athena (The Heroes of Olympus #3)(58)

She hoped it might be Percy, but instead Frank Zhang poked his head in.

“Um, sorry,” he said. “Could I—?”

She was so startled to see him, it took her a moment to realize he wanted to come in.

“Sure,” she said. “Yes.”

He stepped inside, looking around the cabin. There wasn’t much to see. On her desk sat a stack of books, a journal and pen, and a picture of her dad flying his Sopwith Camel biplane, grinning and giving the thumbs-up. Annabeth liked that photo. It reminded her of the time she’d felt closest to him, when he’d strafed an army of monsters with Celestial bronze machine guns just to protect her—pretty much the best present a girl could hope for.

Hanging from a hook on the wall was her New York Yankees cap, her most prized possession from her mom. Once, the cap had had the power to turn its wearer invisible. Since Annabeth’s argument with Athena, the cap had lost its magic. Annabeth wasn’t sure why, but she’d stubbornly brought it along on the quest. Every morning she would try it on, hoping it would work again. So far it had only served as a reminder of her mother’s wrath.

Otherwise, her cabin was bare. She kept it clean and simple, which helped her to think. Percy didn’t believe it because she always made excellent grades, but like most demigods, she was ADHD. When there were too many distractions in her personal space, she was never able to focus.

“So…Frank,” she ventured. “What can I do for you?”

Out of all the kids on the ship, Frank was the one she thought least likely to pay her a visit. She didn’t feel any less confused when he blushed and pulled his Chinese handcuffs out of his pocket.

“I don’t like being in the dark about this,” he muttered. “Could you show me the trick? I didn’t feel comfortable asking anyone else.”

Annabeth processed his words with a slight delay. Wait…Frank was asking her for help? Then it dawned on her: of course, Frank was embarrassed. Leo had been razzing him pretty hard. Nobody liked being a laughingstock. Frank’s determined expression said he never wanted that to happen again. He wanted to understand the puzzle, without the iguana solution.

Annabeth felt strangely honored. Frank trusted her not to make fun of him. Besides, she had a soft spot for anyone who was seeking knowledge—even about something as simple as Chinese handcuffs.

She patted the bunk next to her. “Absolutely. Sit down.”

Frank sat on the edge of the mattress, as if preparing for a quick escape. Annabeth took the Chinese handcuffs and held them next to her computer.

She hit the key for an infrared scan. A few seconds later a 3-D model of the Chinese handcuffs appeared on the screen. She turned the laptop so that Frank could see.

“How did you do that?” he marveled.

“Cutting-edge Ancient Greek technology,” she said. “Okay, look. The structure is a cylindrical biaxial braid, so it has excellent resilience.” She manipulated the image so it squeezed in and out like an accordion. “When you put your fingers inside, it loosens. But when you try to remove them, the circumference shrinks as the braid catches and tightens. There’s no way you can pull free by struggling.”

Frank stared at her blankly. “But what’s the answer?”

“Well…” She showed him some of her calculations—how the handcuffs could resist tearing under incredible stress, depending on the material used in the braid. “Pretty amazing for a woven structure, right? Doctors use it for traction, and electrical contractors—”

“Uh, but the answer?”

Annabeth laughed. “You don’t fight against the handcuffs. You push your fingers in, not out. That loosens the braid.”

“Oh.” Frank tried it. It worked. “Thanks, but…couldn’t you have just shown me on the handcuffs without the 3-D program and the calculations?”

Annabeth hesitated. Sometimes wisdom came from strange places, even from giant teenaged goldfish. “I guess you’re right. That was silly. I learned something too.”

Frank tried the handcuffs again. “It’s easy when you know the solution.”

“Many of the best traps are simple,” Annabeth said. “You just have to think about it, and hope your victim doesn’t.”

Frank nodded. He seemed reluctant to leave.

“You know,” Annabeth said, “Leo doesn’t intend to be mean. He’s just got a big mouth. When people make him nervous, he uses humor as a defense.”

Frank frowned. “Why would I make him nervous?”

“You’re twice his size. You can turn into a dragon.” And Hazel likes you, Annabeth thought, though she didn’t say that.

Frank didn’t look convinced. “Leo can summon fire.” He twisted the handcuffs. “Annabeth…sometime, maybe could you help me with another problem that’s not so simple? I’ve got…I guess you’d call it an Achilles’ heel.”

Annabeth felt like she’d just had a drink of Roman hot chocolate. She’d never really gotten the term warm and fuzzy, but Frank gave her that sensation. He was just a big teddy bear. She could see why Hazel liked him. “I’d be happy to,” she said. “Does anyone else know about this Achilles’ heel?”

“Percy and Hazel,” he said. “That’s it. Percy…he’s a really good guy. I would follow him anywhere. Thought you should know.”