Stalking Darkness is the conclusion of most of the threads set up in Luck in the Shadows. It picks up where the last book left off. Traitor's Moon moves in time a bit and covers the consequences of the first two books. If you liked the first book, you'll definitely want to complete these two books.
Both of these books are good and have a nice emotional connection to them. (And the slow burn on the romance final pays off). There are further books in this series, but I found my interest in them dropping a bit and I have not read the last two released books yet. I'll post them on this blog when I go get to them.