There might be no more erotic a summer thriller than Jacques Deray’s La Piscine (The Swimming Pool). Set in a villa overlooking Saint Tropez, and starring Alain Delon and Romy Schneider, both at the height of their beauty—as well as a 23-year-old Jane Birkin who radiates seduction—it tells the tale of a tidy little ménage à trois that becomes a messy (and mortal) ménage à quatre. Released in 1969, with a score by Michel Legrand, it’s long been considered a masterpiece of French noir. This movie is like the heat of an August holiday in the South of France—it will linger beneath your skin for years afterward. —Michael Hainey