"An electrifying novel about the primal and unyielding bond between a mother and her son, and the lengths she'll go to to protect him. The zoo is nearly empty as Joan and her four-year-old son soak up the last few moments of playtime. They are happy, and the day has been close to perfect. But what Joan sees as she hustles her son toward the exit gate minutes before closing time sends her sprinting back into the zoo, her child in her arms. And for...