This is an excellent series with a viviv and well researched historical background, a clever and unusual main character and solid mysteries that keep me guessing.
I loved this one as I loved the first one. It's better read them in order.
Highly recommended.
Many thanks to the publisher for this ARC, all opinions are mine

I read the next book almost immediately after the first. Although it is the third in the series (according to the listing), it does make sense to read it back to back because some of the other characters not only recur but impact the flow of the story as a whole. I did not feel like I missed anything storywise in the middle. It has been four years since our protagonist got himself involved with the police while trying to help a woman he had become infatuated with (however unwise it all was). Planes have now become the new big thing, and the author does a great job of talking about what it would have looked like at the time. The people closer to the war were more interested in the outcome because of the repercussions it might have the next time around when the country has to fight. Rowlands is now part of the blind war veteran federation, and in that capacity he is taking a group of them to an air show.
I would not recommend reading this without having read the first because of the weight that it has on this story. The author explains the struggle Rowlands has to go through to get to this point, but all the previous investigation and the fears that come with it are a deep part of him. The fears all come true when a man is found dead in the aerodrome the second time he is there. He is once again involved in this story as he tries to clear yet another woman in this situation.
I actually liked the mystery of this story more than the previous one, but I guessed the culprit quite early on.
The ethical fights within our protagonist's head and the number of people who seek him out form the bulk of the story. Although I was happy to spend so much time with his family, all of that had more of a presence than the actual investigation.
It felt more like a borderline thriller than a mystery, with an unknown, invisible culprit hiding just behind Rowlands taking advantage of the latter's lack of sight. Most of the characters have multiple facets to them, and they keep showing off a different side to them, confusing the other people who are trying to pin them down.
I would recommend this book and the series to those readers who like a more immersive approach to their historical mysteries.
I received an ARC thanks to Netgalley and the publishers but the review is entirely based on my own reading experience.

An excellent cosy mystery story with more than a whiff of the Golden Age about it. A taught plot and interesting characters, and a nice twist in the denouement. I did guess it, but only by using detective fiction rules of thumb rather than sifting and assessing the evidence.

Frederick Rowlands, who was blinded during WWI has a job with St. Dunstan's, an agency that tries to help those blinded during the war. He has lined up a trip to Hendon Aerodrome for the St. Dunstan's men as well as his 3 children. He goes for a tour ahead when a famous aviator, Percival is coming in from Australia. When he returns home, he finds his sister Dorothy and her son who have returned from Argentina after her husband died.

Percival is a womanizer, is enamored by Dorothy, and invites them all to come for a ride in his plane. Soon, one of the men who works on planes is found dead in the hanger as Rowlands is approaching the hanger. When a plane suddenly crashes, it is found that the plane has been tampered with. Then, Rowlands finds a dead body. Finally, at a party which Rowlands is attending, the hostess is almost killed. Chief Douglas who has worked with Rowlands is sure the four deaths are related, but isn't quite sure how. Rowlands is an excellent listener, even though he can't see very much, and he continues to mull things over and talks occasionally with Chief Douglas. Finally Rowlands realizes who is responsible for the deaths, (someone I wasn't suspecting!) and tells Douglas.

Frederick Rowlands is a great character, and the book was clever and exciting. I thank Netgalley and Allyson & Busby for an ARC . The opinions stated here are my own.

A well written mystery strengthened by vivid historical background. A bit slow at the start, but once murder occurs the narrative speeds up. Koning also uses lots of misdirection to keep the reader guessing. Unfortunately, I found my interest waning well before the end. There is one significant highlight though. The lead protagonist, Frederick Rowlands, makes for an unusual, not always likable, but very effective investigator.