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In page Towards Zero:

"

Christie first wrote a stageplay under this title in 1945, with one week of performances in Martha's Vineyard in the U.S.[citation needed] The script was uncovered in 2015 by Julius Green.[1][2] The play was also performed in 2019—at The Maddermarket Theatre, Norwich, England—using the 1945 Christie stageplay discovered by Green.[2] As the only prior staging of this version of the play was in Martha's Vineyard in 1945, The Maddermarket proclaimed this the first performance of this stageplay in Europe.[citation needed]