The Voice topped Monday, but fell to a season low for a performance show.
The two-hour episode drew 10.6 million viewers and a 3.4 in the adults 18-to-49 demographic, down 11 percent from last week. Revolution (5.8 million, 1.9) was flat.
Dancing with the Stars' finale performance show (14.7 million, 2.5) grew five-tenths, but was down four-tenths from last spring's performance finale. The series premiere of Canadian import Motive followed with 6.8 million and a 1.4, down seven-tenths from Castle's numbers last week.