When Walt Miller visits his grandson Tom he brings a bloodhound named Tracker, a dog that loves everybody and everything, except snakes. Walt relates the unforgettable story of how he found Tracker and tells of the dog's amazing sense of smell. When Walt has to leave suddenly, he asks Tom to take care of Tracker. Much to the chagrin of Tom's father, his mother champions Tom having his first dog. Tracker stays. Tom and his best friend Randy spend their summer vacation in the bliss and innocence of childhood, discovering Tracker's incredible abilities. Then... Tracker sniffs trouble A web of mystery and intrigue is uncovered by the boys and their incredible dog. During their awesome adventure, the boys discover their inner strengths. They learn the value of loyalty, believing in themselves, and doing the right thing. They discover there is nothing in the life of a boy quite like having a dog, and that sometimes all that is necessary for good to prevail, is for innocence to triumph over evil and to have a dog named Tracker.