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River Deep will appeal to readers who like a good, cozy mystery but are not overly familiar with procedure because the plot hinges on a blatant procedural error any seasoned crime fiction reader will recognise and then guess most of the plot, as I did. This is a shame as the plot, although not new, is quite Machiavellian. However, having guessed very early on what was happening, I didn't particularly enjoy it as found myself continually thinking "why didn't they ...?" (no spoilers). Otherwise it is well written and plotted.