|This needs a stretch.|
The gang's Hawaiian vacation is cut short with a mass ghost sighting near the condos that they are staying in. The gang goes out and exposes the ghosts as locals who are trying to keep developers from building more condos on sacred land. The gang goes along with them in order to convince one of the developers to change the location of his building project.
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"Night Marchers" isn't much of a mystery. The culprit will seem obvious as will the rationale behind the haunting crime, but Michael Kraiser gets points for breaking from the formula in the conclusion and conjecturing a novel mask for the gang to pull away.