King & Kayla are back on the case in this laugh-out-loud mystery from the Theodor Seuss Geisel Honor Award-winning series. King and Kayla receive a mysterious letter written in code. Mason received an almost identical letter. How can they crack the code? Kayla notices that there aren't any vowels in most of the words; you can't write words without vowels. When she compares her letter to Mason's, only one word is different. Sensitive...