Diabolique (1996)

In the shadowed halls of a timeworn school, a sinister plot unfolds. Guy Baran, the unscrupulous dean, is caught in a disquieting love triangle between his ailing wife Mia, a dedicated teacher, and his cunning mistress Nicole Horner, another educator within the same walls. Trapped in a web of exploitation and deceit, Mia and Nicole hatch an audacious plan to annihilate the malevolent Guy. One fateful day, they execute their plan with chilling precision. Mia sedates her husband with spiked whiskey, and together, they submerge him in a bathtub, moving on to deposit his lifeless body into the school's swimming pool. Subtle as a serpent, Nicole discards her keys into the pool, anticipating the discovery of Guy's body by the unsuspecting janitor when he drains it. However, when the pool is finally emptied, it reveals not the grim secret they had planted, but an enigma - Guy's body is nowhere to be found. The pair are engulfed by paranoia, suspecting that someone else might have stumbled upon their deadly secret. Meanwhile, retired Detective Shirley Vogel, a seasoned sleuth with an insatiable curiosity, begins to probe into Guy's mysterious disappearance. As she inches closer to the truth, Mia's nerves fray, threatening to shatter the fragile facade of their alibi. Adding to their spiralling panic, a school pupil claims to have seen Guy, alive and flourishing. Caught in a lethal game of cat and mouse, Mia and Nicole are pushed to their psychological brink. Where is Guy Baran's body, and is it possible that he still draws breath? As the plot thickens, the line between perpetrator and victim blurs in this chilling tale of deceit, paranoia, and possible resurrection.

Diabolique is a horror movie featuring Sharon Stone and directed by Jeremiah S. Chechik.

Diabolique is currently streaming for free (ad-supported) on Plex and Plex Player and it's also available on Amazon Prime Video.

It is also possible to buy Diabolique on Amazon Video, Apple TV, Google Play Movies, Vudu and YouTube.