Kind of "pre-summer" trash...This had an interesting plot idea: the brain of a wealthy industrial leader (male) is transplanted into the body of his beautiful young female assistant. It could have gone in a lot of directions from there. Heinlein chose to explore a few of the psychological problems that might arise from such a ridiculous premise. I think the ending was successful, but he could have cut out about 1/3 of the book's length without losing much.