Just so you know.....Lovecraft and Howard were friends. They corresponded throughout their lives and Howard was a member of the Lovecraft Society of riters. The Kane stories were short lived tho and many believe that most of them were destroyed by Howard shortly before his death. What little was published was the basis for the movie but Im certian that some liberties were taken to make it for the screen as is always the case. Take the time to read the stories for yourself. You can generally find them published together as a collection

Solomon Kane
Trailer
(2:00)

Solomon Kane
Trailer
(2:00)