S4 E1: The Past is Parent

S4 E2: Evidence of Things Not Seen

S4 E3: Tag, You're Me

S4 E4: All My Exes Live in Essex

S4 E5: The Games Underfoot

S4 E6: The Cost of Doing Business

S4 E7: Miss Taken

S4 E8: A Burden of Blood

S4 E9: Murder Ex Machina

S4 E10: Alma Matters

S4 E11: Down Where the Dead Delight

S4 E12: A View With a Room

S4 E13: A Study in Charlotte

S4 E14: Who Is That Masked Man?

S4 E15: Up to Heaven and Down to Hell

S4 E16: Hounded

S4 E17: You've Got Me, Who's Got You?

S4 E18: Ready or Not

S4 E19: All In

S4 E20: Art Imitates Art

S4 E21: Ain't Nothing Like the Real Thing

S4 E22: Turn It Upside Down

S4 E23: The Invisible Hand

S4 E24: A Difference in Kind