To Detective Constable Ethan Callaway, it seemed that life could not get any better, but when a woman he meets ends up in intensive care, the search is on for the man who tried to kill her.

The catch: the suspect knows that she and Ethan are more than just acquaintances.

Thrown into a whirlwind chase, Ethan suddenly finds himself fighting for not only his own life, but for the lives of those he loves.

When Josh is introduced to May, he is at once captivated by her. But when an unknown creature comes to them in the night, injured and desperate, May is swiftly allured by his humanlike qualities and agrees to help him.

In the morning, they awaken to tragedy.

Now, Josh must make impossible decisions when it comes to the creature's fate, and as the death toll begins to rise, he must convince May that the creature is not as innocent as he claims to be.

Before they know it, they are running for their own lives, and their only chance of survival - and that of humanity - rests in dangerous hands.