Some Broadway theatergoers last season enjoyed Whodunnit, a comedy in which the murderer obscured his crime by hiring a troupe of actors to impersonate guests at a party. David Landau, heading an enterprise called Murder To Go Inc. (225 Varick St., New York 10014), is making the idea available for party fun. He produces "participatory murder mysteries," sprinkling impostors among regular guests - only you, the host, know which is which - until the "victim" is done away with and a police inspector arrives to grill suspects and unmask the criminal. Costs vary, depending on the custom-written scenario you request, number of actors required, and transportation, but figure on $2,000 minimum to enliven a private party in the Northeast. Landau, who has produced mock murders on several private train trips, has one on tap in a Victorian mansion during a three-day Halloween trek to Cape May, N.J. For $200, you can work with 50 people to solve the crime and seek a buried treasure hidden by the marketers of Captain Morgan's spiced rum. In January, he's scheduled to stage a "shipboard murder" for Holland America passengers taking a $13,955 around-the-world cruise on the Rotterdam.

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