Jason's brother Darius is getting married and Marcus desperately wants to hire out the Crown and Toga for the occasion, while Grumio offers his services as wedding planner.
The boys face uncertainty when Landlord evicts them without notice from their flat. Marcus hopes his parents, who are visiting for the weekend, will help him onto the property ladder.
There's a heatwave in Rome and Marcus has invested in a new gimmick for the bar - ice. Plus, Grumio develops a hat-parasol hybrid, which attracts attention.
The boys gate-crash a posh banquet, where Marcus tries to win favour with the host, Jason seduces a bored aristocrat and Grumio overhears a poison plot.
The boys set off on a wine-buying trip to Tuscany, but a cart collision sees Jason hooking up with a local milk maid and Grumio developing a taste for foraged truffles.