After a young woman is kidnapped from a hotel, Detective Rook Grayscale and his assistant Nate are sent to investigate.

Inspired by Ace Attorney Investigations and with an aesthetic similar to an old noir film, Detective Grayscale puts you in control of the titular character. Investigate the crime scene along with other areas as you question various witnesses to the crime. Present evidence to any suspicious testemony to pull out more truth. Just be careful of presenting feely, as each time you present the wrong evidence or question the wrong testimony, you'll lose some respect. Lose it all, and the case will hit a dead end.

Are you smart enough to deduce who the kidnapper is? Or will the criminal get away with their vile crime?