restart_murder_scheme_effect

restart_murder_scheme_effect = {
	show_as_tooltip = {
		start_scheme = {
			type = murder
			target_character = scope:target
		}
	}
	hidden_effect = {
		scope:scheme = {
			# Track how many times we've restarted, so we can reset progress.
			increment_variable_effect = {
				VAR = scheme_reset_to_zero_value
				VAL = scheme_success_chance
			}
			# Reset our scheme.
			reset_failed_scheme_effect = yes
		}
	}
}

As written in game/common/scripted_effects/00_scheme_scripted_effects.txt.