My Sister Sadie is a 2003 play by British playwright Alan Ayckbourn.
[1] It was billed as a "family" play, and shown as the Stephen Joseph Theatre's Christmas production.
It is about a seventeen-year-old boy who finds, emerging from a helicopter crash, a mysterious female who calls herself "Sadie", with an uncanny resemblance to his dead sister, with a military platoon in hot pursuit of a missing deadly weapon.
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