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A very different story from the rest of the series which was at the same time refreshing and detracting.
The multiple POVs were a little unbalanced with Maria's sections the more interesting of the three. I'd also say that the book title is a little misleading in that the Fiddlehead itself merely started the proceedings and barely featured otherwise.
The siege also felt like it went on a bit too long. Maria did something interesting, back to the siege, back to Maria doing more interesting stuff, back to the siege, etc. However, but the end I did find myself really routing for the President.
The conclusion was fine, but it did feel like a bit of a missed opportunity. The zombies (or any otherworldly thing) are always going to be one of the intriguing aspects of a story and the resolution is only hinted at.
This is also the least chronologically dependent book in the series. Yes, it does reference the events and characters in the other books, but only in passing. Knowledge of those books wouldn't change to relevance of the references.
The stand out character was the mysterious Kirby Troost who could very well feature in his own spin-off series.