The Vanishing Investigator

The Vanishing Investigator is a 1983 role-playing game adventure for "Gangbusters" published by TSR.
Contents.
"The Vanishing Investigator" is a mystery adventure in which the player characters are part of a task force involved in the search for a senator who disappeared shortly before his Senate Committee on Organized Crime was to start hearings.
Reception.
Jerry Epperson reviewed "The Vanishing Investigator" in "Space Gamer" No. 70. Epperson commented that "If you are looking for a well-executed mystery, this one has all the elements, but is more of a guided tour than a 'whodunit.' Some will be disappointed by this; I was. That's why "Vanishing Investigator" gets only a qualified recommendation. With a little more work, this could have been really good."