I'm currently doing the rounds of agents with my co-written manuscript, and have just had another rejection which offered no more feedback than a short sharp "no thanks." I'm not in any way complaining about this. I completely understand and accept that agents don't have the time to give detailed critiques to non clients. Before I submit it to another agent, I'm considering hiring an editor to go through the manuscript and give my co-author and myself some constructive advice and feedback as to why it might not be working at the moment. We’ve been over it many times, re-drafting, editing, sharpening up, etc, but there comes a time when it needs a fresh and impartial pair of eyes. What's the form on us doing this? Is it acceptable or would another agent not be happy to look at a manuscript which has been edited by an industry professional?