Poldark (2015) - Season 4 Episode 7 -

The Poldarks, Enyses and Warleggans enjoy London's distractions. George dotes on Elizabeth, delighting at the prospect of an heir and announcing plans to host a charity ball, but their domestic bliss soon comesunder threat. At the Warleggan ball Adderley takes a fancy to Demelza, betting George he'll cuckold Ross within a month, which gives rise to deadly complications.