We fell right into the enemy's trap.
彼は会社を乗っ取る計略を練っている。
He is devising a scheme to take over the company.
計略 is a more neutral word for a calculated plan or ruse, while 謀略 carries a stronger connotation of malice or betrayal.
計略 is a devised stratagem used to achieve a goal, often in strategy or warfare, while 企み carries a stronger sense of underhandedness.
Compound of 計 (plan, measure) and 略 (abbreviation, strategy). The combination conveys a carefully devised plan or stratagem.