As a born contrarian, I can't stand either
The Yellow Room (I seriously wished savage painful death on the teenage brat detective) or J.D. Carr's work - in
The Hollow Man The
ONLY bit I liked was the 'how it's done' treatise, quite brilliant stuff. My personal advice would be skip the book EXCEPT that bit
On a slightly more serious note, despite loving the "how to" treatise written by the acknowledged master of the genre, I have not found any locked room mysteries I read after it to have been in any spoiled for me.
The British author Tom Mead is a serious JDC afficionado and has written about him and written intros for some editions of JDC books. His own locked room novels I love -
Death and the Conjuror and
The Murder Wheel