I can understand a 5 star review if this book is your first taste of Maria McCann, and your expectations of history-based fiction are not very high - she is a fabulous writer, and deserves all the praise she gets.
but if you've read As Meat loves Salt, and were as blown away as I was, this book is not a patch on that first one. Jonathan is so tame, the 'mystery' takes so long to unfold (and you can see what's coming), his family is so loving,etc etc. - I missed the ambiguity, the ethical morass, the power, and the unforseen/potentially fatal that she displays so well in AMLS. there, the ground shifts under your feet, and you are kept constantly off-balance, in your emotions and perceptions.
I was never really holding my breath for Jonathan - dear oh dear, another bad dream .....