And to Dust We Shall Return.

How do you catch a criminal made of smoke?
When tragedy strikes an important diplomatic mission, Commander Nim' Chief security officer of the union vessel ss specific, is forced to confront just such a question. But to find an answer Nim must learn to separate the monsters of her past, from the uncertainty of the present. Not an easy task when your suspect can literally slip through your fingers.

Basically just an episode of star trek. But with original characters, plus a side order of silliness.