http://www.amazon.com/This-Perfect-Day-A-Novel/dp/160598129X...
And I noticed she (Ira Levin) had written "Rosemary's Baby" - I had no idea the movie was an adaption! http://www.amazon.com/Rosemarys-Baby-Ira-Levin/dp/1605981109
IIRC this instance of an Ira is a "he" not a "she"
[1] http://en.wikipedia.org/wiki/Ira_Levin#Novels
http://www.amazon.com/This-Perfect-Day-A-Novel/dp/160598129X...