You're talking a prolific writer when he puts out a book with links to all his other books. I found it helped me keep track of the books I've read and which ones I haven't.
Dawson's books are in the spy thriller category, but more like the Bourne books than James Bond.
John Milton is his ex-special forces turned black ops for MI6 antihero. He is sent to kill someone by Control and after he kills his target the man's daughter comes out and sees him. His orders are no witnesses, but he balks at killing a child and leaves her alone. He knows that Control will put a hit out on him for compromising the op. Milton goes into hiding as John Smith and his trying to stay ahead of his group and also helping out people in distress has led to so far 18 books.
I've read a number of other authors with similar premises. John Milton is different in an interesting way. He's a recovering alcoholic. While he was killing people he used booze to make him forget. When he has to run he starts going the AA meetings and sobers up. One of the steps of AA is making restitution to those you've harmed. He can't do that for those he's killed so he pays it forward by helping those in need. It gives Milton a plausible explanation for getting involved.
Some of his trying to help goes bad. The ones he helping are hurt more by his interference than if he stayed out of it. This is also different from other heroes of this genre.
These books are a fast read most of them less than 100,000 words.
Beatrix Rose is another rogue operative that has a contract out on her by MI6. She's also dying of cancer and is trying to protect her daughter while on the run. There are currently nine books in this series.
If your into a quick read, also a story that captures your imagination these books are for you.