the storeroom overlooked an abandoned yard surrounded by a fence and that there was a dilapidated lean-to shed in the yard. 

Since the storeroom window was caked with grime, the professor had to rub out a spot in the thick coating of dirt before he could look through the glass. As he looked through the window, the professor saw two girls (of about eleven or twelve-years-old) and a little boy (of about four-years-old) coming through a hole in the fence.

The professor had seen both of the girls before; the first, called April, once entered his store, while the other, an African-American girl, was a resident in the neighborhood. The little boy, also African-American, was undoubtedly the second girl's brother. Because he had a customer waiting, the professor had to make his way back to the front of the store.

Later, after the customer left, the professor made his way back to the storeroom. From the storeroom window, he could see that the children had made changes to the surrounding yard. They had propped up the lean-to shed with some old porch pillars from the yard and placed a statue of Diana next to it. In the back and center of the shed, the children had placed a chipped, plaster bust of Nefertiti ensconced in a broken birdbath. They had also weeded the yard and placed a thistle flower offering before the Nefertiti birdbath. 

So, the professor stumbled upon the beginnings of the Egypt Game while looking for something in a storeroom in the back of his antique shop.

While the main characters are Melanie, April, and Marshall, the setting for this story is clearly under the domain of the Professor.

It is the storage yard of his proprietorship that the children steal away to, in order to play their secret game.  His unused goods prove to be a veritable smorgasbord of accessories for them to put to use.

As mayhem rears its head in the form of murder, the children's activities are curtailed.  It is not the first one that year. The Professor, being a recluse of sorts, becomes a suspect. This idea is bolstered by the police seen at the old man's store.

Children cannot be contained forever, and their secret game resumes. They return to the storage yard. One night April is alone, in the storage yard, with the Professor watching from his store window. Unfortunately, serial killers can also not be easily contained. The murderer attacks the young girl.

Being a protector, not a pervert, the Professor intercedes and summons help.