The case of a missing father is hard to crack . . . even for Felix, a tiny kid with a huge heart and an eye for detail. Eleven-year-old Felix likes being the smallest kid in school. At least he knows where he fits in. Plus his nickname, "Short-lock Holmes," is perfect for someone who's killing it in forensic science club. To Felix, Growth Hormone Deficiency is no big deal. And then Felix learns that his biological...