McCormack will play the central role of Sor Juana Inés de la Cruz, the writer of The House a Desires, a play which was performed as part of the RSC's Spanish Golden Age Season in 2004. According to press materials, "she was a nun with a gift for writing plays and poetry. She was celebrated by the court but her success created alarm and jealousy within the Church."
McCormack's previous theatre credits include The 39 Steps, Nora in Peter Hall's production of A Doll's House at the Bath Theatre Royal, and the UK tour of Rupert Goold's production of Six Characters in Search of an Author.
The Heresy of Love will be directed by Nancy Meckler and designed by Katrina Lindsay, reunited from collaborating on the RSC's current production of A Midsummer Night's Dream.
Further casting is still to be announced.
For further details, visit www.rsc.org.uk.