Salem’s Lot by Stephen King
If you really want to not be able to put a book down, go back to the earliest books written by King. This was his first vampire novel, which he wrote before vampires became a thing. Deliciously chilling. King’s novel may be fiction, but these scary vampire legends might just be true.
Those Across the River by Christopher Buehlman
In 1935, a professor fleeing scandal and his wife move back to a family home in Georgia; it’s located near the ruins of a plantation that was owned by his ancestors. Every month in a strange, sacrificial ritual, the townspeople garland two pigs with flowers and send them across the river; inevitably, the animals never return. What exactly is consuming them? And what will happen when the residents stop sending pigs? A supernatural-inflected Southern gothic that illustrates the price we pay for the sins of the past.