Feel free to read the provided lines here, or from episode one's script.

Clair’s father was never in the picture and her mother passed away when she was three years of age. She was then raised by her grandmother—Beatrice Harper—until her passing. Clair is now in the care of Max’s sister, Cleo Crews.
Although Clair had never met her aunt Cleo before, the two formed an instant bond.
Cleo works as an event planner and is currently organizing a haunted house event for Halloween. Cleo offers to take Clair to the town’s real-life haunted house, which happens to be where the event is taking place.
Clair obviously excepts and is surprised when she arrives at the house to find that it’s not just haunted by one ghost, but multiple. She discovers that one ghost, in particular, is drawing all the other spirits to the house. She takes it upon herself to find out who this ghost is and help them move on.
She’ll make some friends—both living and alive—along the way as she solves this mystery.