It Walks by Night is an Australian radio serial by Max Afford featuring his detective hero, Jeffrey Blackburn.

[1][2] ("It Walks by Night" was also the title of an episode of another Blackburn serial, Grey face.

[3]) Mary McGregor and Douglas Kelly played the lead roles of Elizabeth and Jeffrey Blackburn.

[4] This new casting upset some listeners who were used to hearing Peter Finch and Neva Carr Glynn in the roles.

[5] The serial was being played again in 1954 when Afford died.