The Amazing Mr. Blunden plot
"Follow him into fun, fantasy & fright -- he's a time-traveling ghost who's often out of sight."
The mysterious Mr. Blunden visits Mrs. Allen and her children Lucy and Jamie to ask if they would like to manage an old, dilapidated mansion. Since they now live in a cramped apartment, this is an offer they cannot refuse. At the estate, Lucy and Jamie meet two other children named Sara and Georgie. However, they turn out to be ghosts and tell their story. The two little ghosts ask the kids to help them solve an ancient mystery that involves traveling back in time.