Obscurity factor: 6
Hitchcock was, reportedly, furious when this film was released. It does bear a striking resemblance to Vertigo, but there are unique twists and turns that make it quite different, and, ultimately a great deal more shocking. Michael Courtland (Cliff Robertson) is a New Orleans businessman preparing for a big project. He and his wife Elizabeth (Genevieve Bujold) are hosting a party to celebrate it. After the party Elizabeth and their daughter are kidnapped and held for ransom. In a botched attempt to get them back they're lost in an automobile accident. Jump ahead 15 years and Michael hasn't gotten over the loss. He's built an enormous monument to his family on the highly prized plot of land he and his partner (John Lithgow) were planning to build a development on and still lives alone (save for a housekeeper that's been in the family for years) in the big house he shared with his wife and daughter. A business venture offers an opportunity to go to Rome, and his partner convinces him to go. While there he meets Sandra (also Bujold), who is the spitting image of his dead wife. He becomes completely obsessed with the young girl, but surprises await him when he brings her home to New Orleans.
Obsession was released on DVD in 2001, but is currently out of print, so it's a bit pricey at Amazon. You can, however watch it as an On Demand title there. The trailer is above, uploaded to YouTube by liuczek. The poster is available at MoviePoster.com.
Obscurity factor: 6 (available on DVD, known to De Palma buffs)