For Laura, a dream comes true when she gets to take care of her neighbor's dog during the holidays. The little poodle turns out to be the perfect sniffer dog and discovers an empty Roman grave at a construction site on Eigelstein. But what does the graffiti that someone has sprayed on the wall mean: cave canem - beware of the dog? Her new adventure takes the soccer gang back to the time of ancient Rome and into some tricky situations...