1611 J. Speed ix. xiv. 617/1 The chiefe plot-master the Earle.
1859 W. Chadwick 30 In the reign of James II., or in that of his brother, when he acted plot-master for that brother, many..innocent persons were murdered by law.
2002 (Nexis) 7 June 3 Federal prosecutors targeted Robert as the plot-master and tried to indict him.