deep-laid

The sinister hunchback at once understood that this was a deep-laid plot into which he had fallen.

At first she suspected that the stratagems which had won her heart were the results of a deep-laid plot proceeding from her lover.

Did he think his mamma would not find out the deep-laid plot, which had cost him so much labor?

His deceptions are more subtle and deep-laid than those of the Grecian adept.