Angel Board by newbie horror writer Kristopher Rufty (ISFDB entry) is technically a glitch freebie, since publisher Samhain was offering it as one of their free online book club reads which was supposed to expire last week.
Currently free directly @
Samhain's website (DRM-free, available worldwide). Enjoy it while it lasts.
Incidentally, another more permafreebie promotional short story by Rufty is still available in multiple venues; I'll just link to the Samhain listing here and leave you to sort out the rest:
The Night Everything Changed
Description
Not all angels are sane.
Someone saved David Barker’s life, but he doesn’t know who—or what—she is. Now he’s haunted by the image of that beautiful, nebulous vision with the features of a woman and determined to find out why she appeared when he almost died. David uses an angel board in hopes of contacting her, and unfortunately for him, he succeeds. This angel has loved him all his life, guarded him and protected him. And she’ll hurt anyone who interferes with that love. David’s guardian angel is obsessive, possessive…and homicidal. Her unyielding love for him will leave a trail of grisly “accidents” and murders as she eliminates all those who want to hurt David. Or love him.