The second of two appearances in the series by André Maranne, the first being in E5, The Long Weekend (1959).
The second of two uncredited appearances in the series by Robert Brown, the first being in E9, Dead on Arrival (1959).
The second of two appearances in the series by Howard Pays, the first being in E15, Last Man Lucky (1959).
The fifth of six uncredited appearances in the series by Guy Standeven, the others being in E1, The Thirteen Innocents (1959), E12 The Chinese Mask (1959), E16 No Flowers for Onno (1959), E23 Payment in Advance (1960) and E36 Cargo of Death (1960).
The last of three appearances in the series by David Lander, the others being in E1, The Thirteen Innocents (1959) and E24 Checkmate (1960).