Second paragraph of third chapter:
Clara was twenty-eight years old and, for the past few years, she’d been mixed up with a suspicious gentleman in a blue box who hopped periodically into her life and caused varying degrees of chaos.
I did not write up the two-part story The Zygon Invasion / The Zygon Inversion at the time of broadcast, though I did note that it was my favourite two-part story of Series 9 (though my favourite Capaldi story remains Heaven Sent, also from Series 9). I enjoyed it – there’s some necessary preachiness about the Other, and immigration and terrorism, some very good skullduggery by villains who can look just like you, and some excellent horror in everyday life. The scene of the plane being brought down by a hand-held missile is a bit too close to the bone for me; several friends of friends died when the Russians destroyed MH-17 in a similar way.
The novelisation is a good competent screen-to-page job, adding a bit more background about the Zygon Bonnie (who used to have a boyfriend called Clyde, who looked like Danny Pink). There are a couple of footnotes citing other DW novelisations, including one quoting a books called The Clones of Dr. Funkenstein, for which you will search bookshops in vain. At my reading pace it’s quicker to read the novelisation than rewatch the story, and it’s well enough done. You can get it here.