The Christmas season offers little cheer for Eileen Dunlop, an unassuming yet disturbed young woman, trapped between her role as her alcoholic father's carer and her day job as a secretary at the prison. When the charismatic Rebecca Saint John arrives as the new counsellor at the prison, Eileen is enchanted and unable to resist what appears to be a miraculously budding friendship. In a Hitchcockian twist, her affection for Rebecca ultimately pulls her into complicity in a crime that surpasses her wildest imaginings.