This book is mentioned in a footnote by Gilles Dauvé:
"In 1932, under the name Carl Steuermann, Rühle published a book (available in French, not in English) whose title translates as 'World Crisis; or, Towards State Capitalism.'
As far as I can determine, the book was written in German and published in 1931, but its title is very similar to the one Gilles mentioned.
In any case, I was hoping someone knows more about this — whether it has been unofficially translated into English and whether the book might be available online.