X (Kinsey Millhone Series #24)

Of the #1 New York Times–bestselling Sue Grafton, NPR’s Maureen Corrigan said, she “makes me wish there were more than twenty-six letters.”
 
X—the shortest entry in the English-language dictionary. X—notoriously slippery to pronounce. X—from Greek and Latin and commonly found in science, medicine, and religion. X—the twenty-fourth and trickiest letter in the English language. X—what can it be for?

Come fall, readers everywhere will find out…