Published: Print · 2006 | eBook · 2005 | eBook · 2006
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The magical borders protecting Camp Half-Blood are failing, leaving the demigods' refuge vulnerable to mythological monsters. Percy Jackson learns that his friend Grover is being held on an island in the Bermuda Triangle and sets out to find him. The rescue becomes inseparable from the effort to save the camp, forcing Percy and his companions to face dangers at sea while searching for what can restore its defenses.
| Format | Publisher | Year | Language | Territory |
|---|---|---|---|---|
| Disney-Hyperion | 2006 | English | — | |
| eBook | Disney-Hyperion | 2005 | English | — |
| eBook | Galaxy | 2006 | English | — |