One paragraph plot : Leland brothers ghosts are disturbing people and because of it, the girl who is in charge of Leland hotel is facing some problem. The boss is pushing her to sell the hotel, but she doesn't want to. Soon after that, the Mystery Incorporated gang is arriving in Leland hotel and learns all about it. Then they explore the graveyard where the ghosts appear and find some clues. Clue by clue, they uncover the truth about that Leland brothers' ghosts disturbance case and apprehended the guys who are responsible to the police.
Episode 4 is somewhat interesting and yet, there's a mystery left to uncover. The sound that Shaggy and Scooby heard isn't what they think it is. So, I wonder what the sound is. I feel like they left us hanging.
All in all, as usual, this episode is a nice one too. As for those ones who love to watch ghosts and spirits, I think this one is just for you.