Something sinister simmers beneath the summer sun when Alain Delon gets mixed up in murder in a pair of sultry, Mediterranean-set thrillers. The French actor with the steely blue gaze was at his most impossibly beautiful when he got his star-making breakthrough playing duplicitous charmer Tom Ripley in PURPLE NOON, René Clément’s suspenseful and erotic adaptation of Patricia Highsmith’s novel “The Talented Mr. Ripley,” gorgeously photographed on the Italian coast. More wet, hot danger ensues in Jacques Deray’s LA PISCINE, which casts Delon opposite Romy Schneider and a young Jane Birkin for a chicly seductive tale of sexual tension, jealousy, and violence on the Côte d’Azur.