Mr Evans
I'm slightly puzzled. The red haired woman, Miss McDonald, was the one who came to the playwright regarding the job and was also "Mr Evans" in the final scene. But earlier on, when the playwright is in the pub and hears the plot being discussed between Mr Evans and Janet Murch, was McDonald also Mr Evans at that point, speaking in a raspy voice? Why would Janet Murch have called her Mr Evans if she could see that she was talking to a woman? We know that the person Janet Murch was conversing with wore the perfume - this was established later.
I understand the involvement of the two men - the nanny agency director was part of the plot and the Irishman was his hitman.
Thanks to anyone who can enlighten me.