Read if you love: The Ritual
Barron is one of the best writers of cosmic horror currently working, and the stories in this collection are unparalleled in their quality. Tales here include "Mysterium Tremendum," a novella-length tale of two couples who go on an ill-fated, madness-inducing hiking trip, "Strappado," where visitors to a Banksy-esque guerilla art installation find that they themselves are the art, and "-30-," where two scientists conduct their research in utter isolation -- or not. Barron uses his considerable talent to illustrate and populate a mythos that, while influenced by Lovecraft, is wholly his own.
Read if you love: It Comes at Night
The undisputed king of horror fiction has an expansive and terrifying body of work, but his scariest writing can be found in 1983's Pet Sematary, a nihilistic, viscerally horrifying tale of grief, parenthood, and guilt. It's narrow in scope and all the more gut-wrenching for how well we get to know Louis and his family before things go awfully, inexorably wrong.