A Puzzle for One (S06E11)

S06E01 Feed A Cold S06E01 The Open Web S06E02 Going to Pot S06E02 Cry Silence S06E03 Love ls A Many Splendoured Thing S06E03 The Crimson Halo S06E04 A Night to Remember S06E04 Broken Mirror S06E05 The Battle of Deveraux Dale S06E05 Portrait of a Hero S06E06 Affair of the Heart S06E06 The Inside Man S06E07 To Kill a Memory S06E08 The Upside Down Penny S06E09 One Step to Midnight S06E10 Harvest of Death S06E11 A Puzzle for One S06E12 Lost Sunday S06E13 See No Evil S06E14 Light and Shadow S06E15 A Game of Shadows S06E16 The Man Who Wasn't There S06E17 A Matter of Principle S06E18 Out of the Night S06E19 Carol Lockwood, Past Tense S06E20 The Faces of Murder S06E21 Search for a Whisper S06E22 To Quote a Dead Man S06E23 A Problem of Innocence S06E24 The Danford File