TV highlights: 'Sleepy Hollow' returns on Fox

(All times Eastern.)FINALE WATCH: The "N or M" mystery comes to a close in the season finale of "Agatha Christie's Partners in Crime" (Acorn TV, streaming). On "Grey's Anatomy" (ABC at 8 p.m.), Bailey has a stressful first day as chief of staff, Meredith feels overwhelmed by her many responsibilities, and April worries about her marriage.