Call Me Firefly — James C. Paavola

Eighth graders Sonny and Breanne look nothing alike--a short black boy, a tall white girl. Their special friendship develops when they discover they both have psychic powers: they can read minds and ghosts communicate with them. Book #2 in the Sonny and Breanne Mystery series, new spirit friends get creative as the protect Breanne from a group of girl bullies, and help solve a sixty-year old mystery involving a beloved lion named Elvis.