When an evil force threatens the reclusive Katie Maddox, a shape-shifting healer with an underdeveloped ability to see the future, she needs someone to watch over her. Although the ranks of the Sentinels have been damaged by an attack by their mortal enemies, the Core, they manage to send the highly-protective Maks Altán. Unfortunately, the taciturn and private Maks is suffering from an illness that impedes his powers. Worse, he and Katie are drawn to each other–a dangerous situation, when his animal-form is a Siberian tiger and hers is a deer. Can predator and prey work as a team? Or will they destroy each other before their mysterious enemy strikes?