The Mark of Athena (The Heroes of Olympus, Book Three) by Rick Riordan

to Camp Half-Blood had been all his idea, but Piper suspected there was more to it. The last few weeks, whenever Piper called home, her dad and Mellie had asked her what was wrong. Maybe something in her voice had tipped them off.
    Piper couldn’t share the visions she’d seen. They were too disturbing. Besides, her dad had taken a potion that had erased all of Piper’s demigod secrets from his memory. But he could still tell when she was upset, and she was pretty sure her dad had encouraged Coach to look out for her.
    She shouldn’t draw her blade. It would only make her feel worse.
    Finally the temptation was too great. She unsheathed Katoptris. It didn’t look very special, just a triangular blade with an unadorned hilt, but it had once been owned by Helen of Troy. The dagger’s name meant “looking glass.”
    Piper gazed at the bronze blade. At first, she saw only her reflection. Then light rippled across the metal. She saw a crowd of Roman demigods gathered in the forum. The blond scarecrow-looking kid, Octavian, was speaking to the mob, shaking his fist. Piper couldn’t hear him, but the gist was obvious: We need to kill those Greeks!
    Reyna, the praetor, stood to one side, her face tight with suppressed emotion. Bitterness? Anger? Piper wasn’t sure.
    She’d been prepared to hate Reyna, but she couldn’t. During the feast in the forum, Piper had admired the way Reyna kept her feelings in check.
    Reyna had sized up Piper and Jason’s relationship right away. As a daughter of Aphrodite, Piper could tell stuff like that. Yet Reyna had stayed polite and in control. She’d put her camp’s needs ahead of her emotions. She’d given the Greeks a fair chance…right up until the Argo II had started destroying her city.
    She’d almost made Piper feel guilty about being Jason’s girlfriend, though that was silly. Jason hadn’t ever been Reyna’s boyfriend, not really.
    Maybe Reyna wasn’t so bad, but it didn’t matter now. They’d messed up the chance for peace. Piper’s power of persuasion had, for once, done absolutely no good.
    Her secret fear? Maybe she hadn’t tried hard enough. Piper had never wanted to make friends with the Romans. She was too worried about losing Jason to his old life. Maybe unconsciously she hadn’t put her best effort into the charmspeak.
    Now Jason was hurt. The ship had been almost destroyed. And according to her dagger, that crazy teddy-bear-strangling kid, Octavian, was whipping the Romans into a war frenzy.
    The scene in her blade shifted. There was a rapid series of images she’d seen before, but she still didn’t understand them: Jason riding into battle on horseback, his eyes gold instead of blue; a woman in an old-fashioned Southern belle dress, standing in an oceanside park with palm trees; a bull with the face of a bearded man, rising out of a river; and two giants in matching yellow togas, hoisting a rope on a pulley system, lifting a large bronze vase out of a pit.
    Then came the worst vision: she saw herself with Jason and Percy, standing waist-deep in water at the bottom of a dark circular chamber, like a giant well. Ghostly shapes moved through the water as it rose rapidly. Piper clawed at the walls, trying to escape, but there was nowhere to go. The water reached their chests. Jason was pulled under. Percy stumbled and disappeared.
    How could a child of the sea god drown? Piper didn’t know, but she watched herself in the vision, alone and thrashing in the dark, until the water rose over her head.
    Piper shut her eyes. Don’t show me that again, she pleaded. Show me something helpful.
    She forced herself to look at the blade again.
    This time, she saw an empty highway cutting between fields of wheat and sunflowers. A mileage marker read: TOPEKA   32 . On the shoulder of the road stood a man in khaki shorts and a purple camp shirt. His face was lost in the shadow of a broad hat, the brim wreathed in leafy vines. He held up a silver goblet and beckoned to