When a Jack Russell Terrier named Mrs. Henry takes a drink from an ancient, forgotten cup in a South Dakota cabin, she doesn't just quench her thirst—she gains a voice and a mission.

Rescued from Jerusalem by Vikings during the crusades and hidden for a millennia across the great plains of the Midwest, the Holy Grail has awakened. Now, Mrs. Henry must protect the grail from the Organization as she guides a soon-to-be legendary songwriter to find his voice and fulfill a destiny that will echo for generations.