I really enjoyed the sophisticated pen and hope to see more. Wonderful development -- of each story. Waterhouse created Garner Quinn, a character to whom anyone with an ounce of critical marrow could relate. Garner Quinn could easily live on in subsequent stories -- which could be the flaw with this one.
Waterhouse, in her enthusiasm to create a brilliant mystery, actually created two. If it had worked, the brilliance would have been in the glue that held them together. Instead, without any connection whatsoever, other than Quinn's frantic pace of overlapping one crime with another, all that is left is a quick summary, short explanation of why any of it happened at all.
I think that with more indepth development of a single plot, further development of her household relationships and the true brilliance of her penmanship, Waterhouse will become one of the best in this genre.