The Trials of Apollo: The Hidden Oracle, by Rick Riordan

Apollo, who is the god of the Sun, and the God of Archery, and he is sent down to earth for a reason unknown to him. He searches New York City trying to remember the events that lead him to be struck down from Olympus. He discovers a girl named Meg, and she helps him regain his godly powers. Apollo meets Percy Jackson from Percy Jackson and the Olympians, and he points him in the direction of the Hidden Oracle.

Student, Grade 10