Alien Scream

In the third book of this middle grade sci-fi series, a teen suddenly fluent in multiple languages discovers he is part alien, and someone wants him dead.
 
At Metier Junior High, Jack Raynes is usually the class clown, but lately he has one problem: mustering up the courage to ask the prettiest girl in school, Jenny Kim, on a date. That is until the day he gets hit in the head with a baseball and...