They're involved in the scheme of things

Usage examples of plotters.

Behind the creeper two trailers followed, one containing reserve supplies, and the other automatic mapping and prospecting equipment such as magnetometers, radar topological plotters, laser-spectroscope samplers, et cetera.

I think it is a list of towns where the plotters intend to make their first move.

He thinks this Ganith is important amongst the plotters, and may well be the brains behind the whole thing, although Grenwald has only guessed this, and does not know.

Corstic had not gone to the meeting of the Council, but had heroically remained at home, alone amid unnaturally sleeping servants, to combat the plot and the invading plotters, with great success.

Amid the clutter, in plain sight as he had been told by the plotters, rested a lustrous little figurine the color of pearl: a cat.

King of Mandria possessed a mind as ruthless, sharp, and manipulative as any of the plotters and intriguers in his court.

A couple of vociferous plotters were summarily executed before the alien craft was located in lunar orbit, subsequent to which discovery the Chaka commander noted his regrets at having ordered the executions.