Another enjoyable installment in this series. 3.5 stars. 
 Before I started, I wasn't sure about this one. A Peter Grant book not set in London?! But it turns out it was exactly what was needed both for the character and the series at this point. After the earth-shattering events at the end of book 4, Peter and the reader need a break. And Foxglove Summer gave us that in more ways than one. 
 Apart from getting out of London, everything about this story felt simpler (in a good way). While I found book 4 jumbled and confusing, Foxglove Summer's story is clear, the mystery and policing straightforward. Or at least as straightforward as you can get when there are invisible unicorns involved. The overarching faceless man plot arc is also parked for the time being, giving us a chance to regroup before whatever's coming in book 6. 
 That said, having enjoyed this short jaunt to the country, I agree with Peter that it's time to get back to London and the rest of the recurring cast. I'm looking forward to finding out what happens next.