The Titan's Curse: Rick Riordan
Percy Jackson and the Olympians Book 3, Paperback
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"When Percy Jackson receives an urgent distress call from his friend Grover, he immediately prepares for battle. He knows he'll need his powerful demigod allies at his side; his trusty bronze sword, Riptide; and . . . a ride from his mom.
The demigods race to the rescue to find that Grover has made an important discovery: two new powerful half-bloods, whose parentage is unknown. But that's not all that awaits them. The Titan lord, Kronos, has set up a devious trap, and the young heroes have just fallen prey."