The second of six uncredited appearances in the series by Guy Standeven, the others being in E1, The Thirteen Innocents (1959), E16 No Flowers for Onno (1959), E23 Payment in Advance (1960), E31 A Foreign Body (1960) and E36 Cargo of Death (1960).
The first of two appearances in the series by Bill Nagy, the other being in E25, Fingers of Guilt (1960).
The first of two appearances in the series by Howard Marion-Crawford, the other being in E28, Ascent to Murder (1960).
The first of two uncredited appearances in the series by Jack Dearlove, the other being in E17, Mr. George (1960).
The first of three uncredited appearances in the series by Mary Maxfield, the others being E33, The Three Keys (1960) and E39 The Absent Assassin (1960).