The Mystery Series by Marty Chan

As the only Chinese kid in the small town of Bouvier, Marty has trouble fitting in, but what he lacks in friends, he makes up for with his imagination. Together with his best friend Remi and their on-again, off-again pal, Trina, Marty solves mysteries both great and small.

Books in the Mystery Series:

The Mystery of the Frozen Brains
The Mystery of the Graffiti Ghoul
The Mystery of the Mad Science Teacher
The Mystery of the Cyber Bully