: How much effort should I spend explaining plot device? I think it is good Idea to start by example: Main hero is given briefcase and informed, that such briefcase contains very powerful bomb.

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My approach: Focus on the main hero's viewpoint. If the main hero thinks about the contents, write that. If the main hero has an opinion about the contents, write that. If the main hero feels some emotion about the contents write that.

The key to deciding what to put in is not what he knows, but what he thinks and feels in the course of the story.

For example: I imagine that the main hero would be quite concerned about how the bomb will go through security. If the bomb is made of materials that might set off detectors, he would think about that as he goes through security. If the explosive is some material that escapes detection, he might think about that.

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I think your question is a bit shallow for proper answer, but i will try to discribe:

1) What kind of story are you telling? Is is criminal story about your hero going in pathway of the briefcase bomb maker?

If it is, your hero will need some information about that briefcase. Color, weight, maybe small details as locks, material of the briefcase or such things like that.

Your hero will need them to have some clues to work on as he will be searching for answers.

2) Different story only about hero not researching crime? I think in this case is your briefcase irrelevant. It is only "thing" that made situation your hero is in. So details of it is not relevant, only thing mentioned is that bomb was in briefcase and it done terrible things. That's it.

I will recommend you to think about, what story you want tell, and after that you will find what details about briefcase you need for a proper story.

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I would say it would depend on whether specifics of the device has any bearing on the plot. In your example the bomb specifications themselves don't seem to be relevant to the story.

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