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From the liner notes

A double feature from legendary director Jess Franco!

Red Silk
When a pair of female private eyes take on what appears to be a routine smuggling operation, they soon realize that they have become ensnared in a vicious art theft/kidnapping/murder and blackmail scheme. They rely more on their wiles than their wits to come out on top.

Snakewoman
A publicist's agent seeks to purchase the rights to the life story and estate of cult movie icon of early 20th Century. When she meets the icon's remaining relatives living a life of hedonism, she uncovers more than skeletons in their closet... she learns that sometimes it the snake who can charm her victim.