Former British spy Sylvia Fox (Emilia Fox) has settled in the Umbrian countryside this season, hoping to enjoy the quiet countryside life, catch up with her sister (Tara Fitzgerald) and renovate her house. However, old habits die hard, and soon she is investigating the murder of a key figure in the local community. Soon, she will also be involved in a dangerous lake party as an MI6 spy. Just when Sylvia thinks she can enjoy her vacation life, a "dead" man suddenly comes to seek revenge. Can Sylvia's family race against time to rescue Sylvia?