The Perfect Husband by Lisa Gardner
Jim Beckett was everything Tess had ever dreamed of ...But two years after Tess married Jim, she helped put him behind bars for savagely murdering ten women. Even locked up in a maximum security prison, he vowed he would come after her and make her pay. Now the killer has escaped, and Tess has got to learn to fight back. With the help of a burned out ex-marine, Tess learns how to protect herself as a gigantic manhunt, crossing four states, counts down to this terrifying reunion between husband and wife.