Mercury Rising by Ryne Douglas Pearson, paperback

(originally published as Simple Simon)

Very good condition. Minor wear on edges of cover. Light tanning on pages. No markings. No tears. No creases.

Synopsis:

Sixteen-year-old autistic savant Simon Lynch is a genius with numbers, capable of unraveling any mathematical problem before him.  When he breaks a government code, the National Security Agency sends a beautiful terrorist after him, with only FBI Special Agent Art Jefferson to save him.