Delitti In Paradiso 1x3 -

You can find more details and full cast information for this episode on IMDb.

DI Poole discovers that the "demon" mentioned was not a supernatural entity but a person from the victim's past. The killer had a long-standing motive related to a past family secret and used the distraction of the fête to administer the poison. Delitti in Paradiso 1x3

Angelique Morel, a local woman who dies during a parish fête. You can find more details and full cast

The "prediction" itself, which DI Poole suspects was a calculated move to frame someone or hide the truth. Resolution Delitti in Paradiso 1x3