The 23rd Letter is a technothriller where players are a Cell in The Network, an underground organisation dedicated to protecting Espers–people with psionic abilities. Players will take on the role of Espers (or not, as they choose!) and play as the entire Cell, working together to try to complete a covert mission. Players will also receive a playtesting credit in the final printed game, the third edition of which is due out later in 2026.