Shards on the Piazza San Marco. Two gangs of children have clashed in the middle of the night. While Commissioner Griffoni tries to figure out with a woman's intuition how a teenager got caught up in the pull of a flash mob, Brunetti uses his own connections. Yes, even Vice-Questore Patta is willing to do anything to protect himself and his people from incidents that are particularly unwelcome in a tourist city like Venice.