"A math-whiz from a trailer park discovers she's the only student capable of unravelling complex clues left by a serial killer who's systematically getting rid of her classmates"-- Provided by publisher.

"In seventeen-year-old Jo River's complicated world of numbers, there's no such thing as coincidence. When she is betrayed by someone she loves, kidnapped by the world's most wanted smuggler, and forced to use her talent to shore up a criminal empire, Jo deems her gift a curse--until she meets Red. Fellow captive and unlikely sage, Red teaches Jo to harness her true potential, so she can do more than just escape. Before he dies, Red reveals a secret...