A new book about Charley Chase has just become available.
I read a previous book about Charley Chase, SMILE WHEN THE RAINDROPS FALL, by Brian Anthony and Andy Edmonds. This book seems to have much the same story, but concentrates more on the later part of his career, after sound came in. I was able to read a little of the new book online at this site:
To me, the films of Charley Chase were a mixed bag. Some of them I liked, and then again there were some I didn't like. But since he was one of Thelma Todd's most frequent costars in the early sound era, he does play a part in the story of Thelma Todd.
A look at Charley Chase's talkies on "The World Of Charley Chase":
World Of Charley Chase home page: