From the introduction:
Welcome to Does Love Forgive? This is a collection of one-to-one scenarios for the Call of Cthulhu roleplaying game. Usually, Call of Cthulhu is played with one Keeper and between two to six investigators. Sometimes, though, it can be hard to get a group of players together, so the scenarios in this collection have been specifically designed for just two people: one Keeper and one player-investigator.
Each of the scenarios can be played over the course of one session, although the Keeper may wish to expand the adventures (based on the investigator’s actions), or create their own follow on adventures. While the first scenario, Love You to Death, is tied to a historical Valentine’s Day event in Chicago, the other scenario, Mask of Desire, can be moved to a different location and, potentially, a different time period other than the one specified, and advice is provided for how to handle such moves.