Folks in Lancaster will have a chance to try their hand at being detectives Thursday as part of an evening of entertainment with “Death Ahoy,” an audience-interactive investigation into the mysterious death of Sunny Sails, cruise director on the good ship “Legendary Carnival.” Each audience member will become part of an investigative team and work with the chief detective to question suspects and help figure out “whodunit.” Cast members of the Charlotte Murder Mystery Company portray the chief detective and suspects.