Is there a complete tutorial for the game?

There are three way you can learn how to play.

1) Tutorial level :- There is a tutorial level that can be played from contract board if you want (NTR warning since some find it offensive).

2) Basement Tutorial :- You will understand basic tool usage and ghost capturing.

3) How To Play option :- If you press 'Escape' you will see this option in the menu.

You can also watch this video on how to detect a ghost.