Assigned to rescue a witness in jeopardy, officer Tucker Dawson and his K-9, Scout, arrive in time to see a car exploding--and interrupt an attempted abduction. Veterinary assistant Tara Piper's witness-protection cover has been blown, and now she must rely on Tucker and Scout to protect her long enough to testify against her brother's murderer. But when a leak in the US Marshals' office is discovered and their safe houses are compromised, trying to run is futile. Can they elude a killer who's always one step ahead or will the pursuit for justice cost Tara her life?