When Tom meets Spider he is sure he has found a friend for life. But their companionship does not run smoothly. Spider can't help being the naughty puppy that he is, and Tom has a lot on his plate: a new school, a bully and his parents' separation.

But both boy and dog are far braver and more determined than anyone could have imagined. And as they journey to be reunited, unbreakable bonds of love are built.