Trail of Cthulhu is an investigative horror TTRPG published by Pelgrane Press in 2008, written by Kenneth Hite and using the GUMSHOE system. Licensed from Chaosium, it is set in the 1930s.
By GUMSHOE’s design, finding clues is automatic, so an Investigator is never blocked by a failed roll. Tension shifts away from dice luck toward interpreting what the clues actually mean and enduring that revelation. It won ENnie Awards in 2008 including Best Rules and Best Writing.