PERCY JACKSON AND THE OLYPIANS - THE TITAN'S CURSE

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 raced to the rescue to find that Grover has made an important discovery, two powerful half bloods, whose parentage is unknown. But that's not all that awaits them. The Titan Lord Chronos has set up a devious trap, and the young heroes have just fallen prey.