The sack wasn’t just drifting gently along like everything else, it was turning of its own accord. There was definitely something inside it, struggling against the side of the plastic bag kicking at it, squeaking and squealing in terror. He had no idea what it might be, only that it was alive and in danger of drowning. When Patrick saves a litter of greyhound puppies from the canal, he can’t bear to hand them all over to the RSPCA.