Australian published edition by Invincible Press, Sydney

Measures approx 200mm x 140mm.

The Sydney-based Invincible Press produced mystery fiction novels, Westerns and soft-cover digests from about 1944 to about 1954. With a mix of American, British, and Australian authors, they published about one book per month.

There are somewhere around a hundred crime novels by well known authors through this time. Many of these are very scarce with copies only re-surfacing every few years.