Denying any responsibility for this is: aliyaist
The author writes:
And yes, before you ask, Margaret knew when walking into the ShopperMart that there was only one way it would end. The cannibals, the stepstool, even the burned-out light bulb in the service corridor - it was all part of her plan.
But the look of surprise on her face now is genuine. She really didn't expect Wanda to be waiting for her in the parking lot. And it was all going so well...