A plot (involving more than one person), conspiracy(noun)
To plot.(verb)
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Use "complot" in a sentence
"As Haglund finds each subject and urges them to expound on their complot du jour, the UFO conspiracies begin to blend neatly into the medical conspiracies which then find connections in the government conspiracies."
"Melanie, Margaret, Sam, et al, in danger of stating the absolutely obvious: there is no complot against Israel!"
"The original impetus was that of return, and reversing the so - called loss of Arab land and patrimony, rather than a fulfillment of post-colonial self-determination via the statehood route; a complot designed after 1967 as a new Palestinian identity with at its core the notion of the armed struggle as a galvanizing force."