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Her friendship blind date was part of Dinner with a Stranger, the society Juliette and her flatmates started "on a whim" for fellow Glasgow University students who want to meet new people.

Nevertheless, even the half-aware viewer will have questions about “The Perfect Stranger,” the novel within the novel, whose events play out on the screen as settled history, and which other characters accept as such, but which is full of things Nancy could not have possibly known.

The power of absence and refusal is perhaps more edifying in literature — see “The Stranger,” “The Quiet Man,” the brick-wall calm of I-would-prefer-not-to Bartleby — than in real life.

My running friend Alice told me that she was donating her kidney to a stranger the following year.

“Lock doors and windows, and do not open to any stranger,” the Sderot municipality told residents in a bulletin.