a crafty and involved plot to achieve your (usually sinister) ends
"The detective realized that the whole affair was nothing more than an intricate intrigue designed to frame his rival for embezzlement."
a clandestine love affair
"After months of secret meetings, his wife discovered that their entire marriage had been nothing but an elaborate intrigue."
A complicated or clandestine plot or scheme intended to effect some purpose by secret artifice; conspiracy; stratagem.
"The detective spent weeks trying to unravel the intricate intrigue that had led to the mayor's sudden resignation."
To conceive or carry out a secret plan intended to harm; to form a plot or scheme.
"The detective realized that the mayor was not just suspicious, but actively intrigued against his own vice president by secretly leaking damaging financial records."