Eventually, the main characters of "Drool Baby" come to realize what readers of the previous book, "A Shot in the Bark," knew at the end of the story, that the serial killer targeting the regulars of a Cincinnati dog park is still alive and killing. When Lia Anderson and her friend Jim begin to investigate the matter, they are warned by Peter, Lia's boyfriend and a Cincinnati police detective, "The killer will be someone you know and like." And, of course, he is correct, for such is the nature of the psychopath next door, a cultural motif that appears nowadays to be more of an uncomfortable truth than a urban myth.
In "Drool Baby," we pick up where we left off in the previous volume, with the killer fondly remembering her last kill, and speculating about future ones. Of course, these murderous interludes, set off from the ongoing narrative though the use of italics and a shift to a first-person POV, are unknown to the covert investigators--Jim and Lia keep their queries covert so as not to be targeted by the unknown enemy while Peter must keep it all "off the clock" because the prior murders have all been officially closed; while there are clues aplenty in the killer's musings they do not help the reader much, so adroit is the author at misdirection, ambiguity and the planting of those all-important red herrings.
The portrayals of the characters are not quite as sharp as they were in the first book, but for those who are following forward they don't have to be--we already know who they are (or think we do in one case) and have mental pictures; for those who are not following forward, the characters in the background are still sharp enough, and the ones in the foreground more so, but you still might want to get the first book before delving into the second, so sequentially dependent are they. In one case, however, the portrayal of one character, the unknown killer, is even more vivid than in the previous book, and that is through the frequent delvings into her "murder book," as it might be termed.
Though the identity is not revealed (that happens in the course of the regular narrative toward the end) you feel that you know this person intimately, know the reasons she does what she does, even if you do not understand them. In addition to a crackerjack mystery (with a little bit of romance, but not so much that I couldn't overlook it) the author has given us a glimpse into the reptilian mind of a psychotic killer who is quickly devolving, spiraling more and more out of control, but who is so self-absorbed, self-deluded and self-justified that she has no idea just how out of control she is.
In addition to the crisply drawn characters, the tightly plotted action, and nicely veiled mystery, the author has given animal lovers a keen set of canine characters integral to the plot (though less in the foreground than in the first book) and a vivid slice of Cincinnati life in the form of local landmarks and cultural vagaries. So, if you enjoy well-written mysteries with realistic characters, sustained suspense, procedural investigations by impassioned amateur sleuths, well-researched psychological profiling, a sense of place, and dogs, then "Drool Baby" is for you...but do start at the beginning of the series for maximum enjoyment and suspense.