Harry Potter and the Son of Poseidon

When Harry learns about some Americans coming to London, he hardly knows that this is the beginning of a whole new adventure. There is a dark force rising, and Harry must team up with these Americans who claim that they are 'half bloods' coming to investigate disappearances at their 'camp'....
This is my first story uploaded at Wattpad so I request you not to take some small mistakes seriously.

P.S. All the wonderful characters used in this book are created in the book belong to J.K. Rowling and Rick Riordan. The storyline is mine though