The dark web by Christopher Lowery.
The Dark Web, is a breathless race against time to prevent deadly threats against our known world. When a computer scientist dies mysteriously in Dubai, Jenny Bishop's nephew, Leo Stewart, is hired to replace him. Leo's life is soon in danger, but he is the only person who can find the key to prevent an impending global cyber-attack. With the help of Jenny and old and new friends, he must find a way to neutralise the threat before the world's vital services are brought to a halt. A shadowy figure, known only as Tsunami, is working behind the veil of international offshore company structures in an attempt to redraw international borders once again and enrich the ruthless authors of the conspiracy. From Moscow and Iraq to Shanghai, Washington, London and Continental Europe, the gripping narrative exposes the tentacles of the Dark Web wrapped around the Earth, giving access and anonymity to the authors of these deadly conspiracies. The Dark Web is a thrilling final chapter in the African Diamonds trilogy.
This was a good read with likeable characters.  I haven't read the first 2 so it may have been a little confusing for me.  4*.

An enjoyable read. Not too heavy. It was entertaining and well thought out. Could easily read another book from this author but unfortunately had missed previous books and the connections with the charcaters. So, thanks to NetGalley for introducing me to this author now.

Eddy Weatherill

It's a great thriller but I would recommend that you read the previous 2 books first .

Thoroughly Entertaining. I really enjoyed the first two books in this series, and this third story is just as good. Christopher Lowery certainly knows how to write an interesting and captivating story. We all read for pleasure, but it’s nice to learn something along the way, and I found it quite interesting reading about Microprocessors, CPU’s, and Internet security. The plot is elaborate and suspenseful, with a diverse range of characters. I also enjoyed that the story is situation in different countries around the world.
Leo Stewart seemed to have well and truly put the kidnapping behind him from year ago. He had since earned a degree and made a name for himself in the world of CPU’s and Microprocessors. So much so, that he found himself being head hunted by another company in Dubai, for the senior VP position, to look after the Microprocessor Development division. The Company XPlus Circuits were due to release an upgrade to ACRE, their new encryption system. With so much cybercrime being committed throughout the world, XPlus Circuits wanted to be the front runner in having a world class system that no one could crack. It’s Leo’s Aunt Jenny that worries about him being in a different country, with unknown risks. After all, someone had already died working for the same company. This is definitely a book you could immerse yourself in, for many enjoyable hours. I’d certainly recommend all three books in the series.