Several years after being kicked off the Metropolitan Police Force (which was at least partly his own fault), William Monk, erstwhile “private enquiry agent” in 1863 London, is finally back in uniform -- though he’s not entirely happy about it. Having gotten involved with crime on the Thames in the last volume, he’s now an Inspector in the River Police (and the Met’s longtime rivals). After her encounter with the plague at her charity clinic, his wife, Hester, an ex-Crimean nurse, has been ordered to stay at home -- at least temporarily. Not that she can help involving herself in whatever injustices come to her notice, however. Monk has witnessed a young couple topple off Westminster Bridge (accident? suicide? murder?) and his investigation leads him into reopening an earlier case of suicide, which was one of Superintendent Runcorn’s cases. (Monk and Runcorn had been friends and close colleagues, then rivals, then enemies, and are now moving slowly back into an uneasy accommodation.) The plot focuses on the urgent need to replace London’s totally inadequate sewer system, occasioned both by the Great Stink of 1858 and by the recent series of typhoid and cholera outbreaks. Of course, there’s lots of money to be made in such a mammoth (and competitive) public works project, and that can lead to sloppy attention to safety regulations and even murder. All of which is well and good (and the details are pretty interesting), but Perry repeats her old problem of letting the narrative get away from her. The plotline is confusing, salient points are repeated numerous times (just in case the reader wasn’t paying attention, I guess), and she has a tendency to make casual reference to earlier events or bits of business that have, apparently, been edited out of the text. On the other hand, she’s been bringing in a whole new group of supporting players lately, both among Monk’s subordinates in his new job and among his other acquaintances on the river, and on the staff of Hester’s clinic. I wish she’d bring back Sgt. Evan, though; he doesn’t deserve to be so cavalierly dumped.