詭計 is read as きけい (kikei) and means tricks.
きけい
kikei
きべん
sophistry
とうけい
statistics
せっけい
plan
ごうけい
sum total
かいけい
economic condition
とけい
clock
けい
かけい
household economy
うでどけい
wristwatch
よけい
all the more
せいけい
livelihood
たいおんけい
(clinical) thermometer