Books 1-5 are only $2.99, [free in KU] and may have been a free boxed set at one time. (Sorry, but I can't really remember.)
https://www.amazon.com/Raines-Landin...+tony+richards
My point is that #6 is free and for a measly $2.99 one can have all 6 titles. Read a bit of #6 and see if you like the writer's style and premise. Or download a sample of the 1-5 set and see if it seems intriguing. If so, the get #6 before it goes off sale.
(I have no affiliation with the author.)