Spooky DnD One-Shot Adventure - Spooky

The characters are members of the local law hunting a criminal.
It is at an underground vault which gives nightmares to any who try to sleep there.
There are a group of smugglers scavenging. And there is a charismatic werewolf seeking to slay everyone by dawn.
At some point someone discovers a secret door.
As the adventure progresses cowled strangers begin to arrive

The characters are members of a faction gathering for a ritual.
It is at a derelict inn which has stone statues in every corner.
There are local nobles and merchants gathered for a masquerade ball. And there is a charismatic werewolf seeking to slay everyone by dawn.
At some point there are wolf howls.
As the adventure progresses there is a series of disappearances

The characters are a group of recently met adventurers sent to meet "someone".
It is at an asylum for the insane which is a place where swans often congregate.
There are a mismatched group of awakened animals sheltering for the night. And a vengeful warlock seeks to burn everything to the ground.
At some point someone is murdered.
As the adventure progresses people start breaking into song

The characters are the crew of a ship who have heard of a party happening here.
It is at a temple on an island which was the site of several murders.
There are a group of scarecrows trying to stay undiscovered. And a mastermind wants to recover a glowing staff.
At some point someone discovers a secret door.
As the adventure progresses people start to gather for a funeral

The characters are travelers looking for a night's shelter, after their coach had an accident.
It is at an underground vault which is in an area affected by a mirage arcana.
There are local nobles and merchants scavenging what they can. And a few creatures are inhabited by intellect devourers who seek new hosts.
At some point a drunk friend of a character arrives.
As the adventure progresses it gets colder and there is a snow storm