With Halloween fast approaching, Cassie and the town of Middleton are hard at work preparing for the annual Harvest Festival. This year, Cassie is transforming Grey House into a delightful haunted house, and when a handsome stranger checks in, the family suddenly find themselves on edge.

The author of a series of magic-and-romance-filled novels comes to Grey House to celebrate the release of her newest book, titled "The Enchantress Unites." But it's Cassie who ends up doing the uniting, bringing together the people of Middleton to put on the special event while also coming to a special realization about Sam.

The Good Witch meets her match when Cassie's long-lost college roommate, Autumn Delaney, makes an unexpected visit to Grey House on a mission to disrupt Middleton's Halloween festivities.