 The play was included in "Murder on Air", a special production from 22 April to 3 May 2008 by the Agatha Christie Theatre Company of three of Christie's radio plays (the other two being "The Yellow Iris" and "Butter in a Lordly Dish") at the Theatre Royal, Windsor.A cocktail party is in full flow at the Kensington home of James and Pam Brent when there is a phone call.Mrs.