I bought a couple of books by Caimh McDonnell when Amazon.co.uk had a sale and enjoyed them very much. Dark humour and a lot of wit. Anyway the first ebook comes with some stuff about getting a free book. There is a link on his web page. It is some of his short stories and is a quick read with a couple of funny tales in there. You can grab it by signing up to his mailing list
here
I think the main books are available in the Kindle Unlimited scheme as well.