Susan returns to England, where she investigates a mystery involving a children's author's death, connected to a 1955 story set in Corfu.

Claire is an MI5 agent who goes undercover as the royal nanny. She must overcome the challenges of her assignment, like resisting the charms of Prince Colin, while keeping the family safe at Christmas.

A charming tutor infiltrates a wealthy family's life, revealing a sinister agenda. As his vengeful plot unfolds, the family must confront the enemy living under their own roof.