"My Decision To Kill Coralie Was Not a Sudden Thing"

HERE WE HAVE a variation on du Maurier with a strong nod to Poe, as an egomaniac's warped love engenders jealousy, culminating in the guilty, swirling darkness deep inside . . .

"The Cranberry Goblet."
By Harold Lawlor (1910-92).
First appearance: Weird Tales, November 1945.

Reprints page (HERE).
Short story (13 pages as a PDF).
Online at Wikisource (HERE).

     "Even if I lose, I'll win."

A battle of wills and wits in the grand HIBK tradition—with a stranger than usual twist . . .

Principal characters:
~ Michael Whittington:
  "I have a sister, Ann. An invalid since she was a child. She'll have to live with us."
~ Coralie Whittington:
  "You see, she's badly spoiled, I'm afraid."
~ Ann Whittington:
  "I'll spoil her, too!"
~ Mrs. Dunnigan:
  ". . . our housekeeper (and Coralie's willing slave) . . ."
~ Doctor Peter Haddon:
  "Deliberately, I'm afraid. But no one need ever know. And I thought it was kinder not to tell Michael."

Resources:
- Rebecca, Daphne du Maurier's 1938 novel, was successfully filmed by Alfred Hitchcock; see the Wikipedia article (HERE: WARNING! SPOILERS!). If you're unfamiliar with the HIBK school, see Wikipedia (HERE) and Mike Grost's article (HERE). EAP's "The Tell-Tale Heart" (1843) is anatomized in Wikipedia (HERE: WARNING! SPOILERS!), with the full text at The 
Poe Museum (HERE).

Illustration by Virgil Finlay.

- Harold Lawlor was an Irishman with a penchant for the bizarre; consult Tellers of Weird Tales (HERE; scroll down), the SFE (HERE), and the ISFDb (HERE).
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~