Colton Neeley, suffering from debilitating flashbacks from combat-related trauma, leaves his military career to take care of his four-year-old daughter and tries to build a new life with Piper Blum, who is keeping secret from him the fact that she is hiding from assasins bent on destroying her family, but when an attempt on Piper's life leads to another's death, the black ops group Nightshade steps in to help.