Out of the Deep I Cry

Out of the Deep I Cry, the third book in Julia Spencer-Fleming's Fergusson series, was not as enjoyable as the first two, and I'm not sure why.  The characters and setting are still strong; the writing is reasonable; the plot is fine.  I think it's partly that the romance angle is getting old.  Three books (and counting) is a long time for an unrequited love story.  But, more, I think that previous books shuttled back and forth between Clare and Russ's points of view.  Here, we're stuck with Clare, and it ends up feeling a bit claustrophobic.  Lastly, with the whole story being from Clare's point of view, I start having the problem I always have with amateur sleuths -- why aren't the police dealing with this instead of you?