Following on from The Call, The Invasion follows characters Nessa, Anto and Aoife as they attempt to eradicate the threat of the fae from Ireland and allow the children of the island to grow up in safety once more, without the fear and threat of the dreaded 'call.'

The Invasion starts pretty much within a few weeks from the ending of The Call and as readers, we're mostly following Nessa and Anto now they have left survival college and survived their call, with some chapters from Aoife's point of view who is still in college and anxiously waiting her own call. I really liked that we got to see some of the rest of Ireland in this book as The Call was more or less only based in the college or in the Grey Lands. In The Invasion, readers see what adults are doing to keep the country more or less running, and how those who survived their call and didn't become completely messed up have lived their lives since then. And how citizens of Ireland are not really free to do anything they want anymore as the existence of Irish people is constantly threatened by the fae.

One of the problems I had with The Call, and continued slightly in The Invasion, is that the age of the characters feels very unbelievable. They are only 14 years old and they talk and act like adults most of the time. I did appreciate that Anto had some moments in this book were he was a scared and emotionally frustrated and confused teenage boy which reminded me that he was indeed only 14.

Seeing more of the Grey Lands in this book was also so intriguing while also at the same time horrifying. There is nothing about the landscape that is comforting or nice in any way, and I just love how the fairy folk are written in this and how they responded to Nessa in this one.

The ending felt a little abrupt and I don't think I was completely satisfied with Aoife's epilogue and how everything was neatly tied in a bow. It felt a bit too cheerful considering everything that had happened. I was left with some more questions -

what happened to the old fairy in the jail? Did we ever find out? Why did time seem to stop for the rest of the world as Ireland was captured by the fae for 25 years?! What really happened to Nessa and Anto - how did they get back to Ireland from the Grey Lands???

Overall, I liked this book but I definitely liked The Call more!