From publisher blurb:
The Calendar Man is a story roleplaying game about a serial killer who cannot be caught. Mimicking films like Zodiac, Seven, Suspect Zero, and Silence of the Lambs, the murders are dark and ghastly, challenging everyone, police and journalists alike. Some of the investigators have seen too much and others have questionable methods to begin with. Can anyone solve the murders or does the Calendar Man walk away?
The Protocol game series uses vignettes, interrogations, interludes, and ensembles to tell a story. Each story explores disparate characters dealing with adversity and isolation in a dramatic fashion.
The Calendar Man is a zero-prep game for 3 or more players. The game length is exponentially long, so games with more players take more time to complete. Home requires a deck of poker cards as well as tokens to track drama points.
This series presumes some understanding of GMless game protocol:
scene-framing, shared authority, and so on.