Forced by an online prowler to ride a connected spin bike above 80 rpm or it will explode, a temporarily blind woman discovers a hidden family secret in her new home.

SYNOPSIS:

Judith Krieg inherits her father, Richard's, Pacific Palisades craftsman in the middle of recovering from eye surgery. To make matters worse her husband is flying to London, leaving her alone. Her pal Susy offers to drop by to keep an eye on her. Waking to discover her husband gone she finds her spin instructor Cornel assembling a new Peloton bike. Without eyesight she gamely goes for a ride only to find the bike has been hijacked by an Unknown Prowler and is rigged for electric shocks if she falls below a cadence of 80 rpm. Our video prowler also informs Judith the bike is booby-trapped with a bomb. She sets out on the ride of her life, while the prowler presses her for the location of her father's hidden cash. A local cop comes by but Judith, agonizingly, has to fob him off.

The prowler torments her with electric shocks when her speed drops but the video feed eventually gets garbled and Judith, exhausted after hours of spinning, answers the front door to another cop, this time LAPD. Still blind, she can't see it is Cornel, her erstwhile tormentor. Dressed like a cop, he makes his way into the house to see if he can persuade Judith to reveal the hidden cash.

Judith quickly realizes it's Cornel and also discovers he's her half-brother, Richard's bastard son. After failing to convince Judith by waterboarding her, he starts on Richard, scouring the backyard as his father tries to remember where he hid the money. In frustration and anger at being cut out of the will, Cornel gouges Richard's eyes out and leaves him for dead.

Judith, sweaty and exhausted, collapses on the couch only to discover the cash is hidden underneath the cushions. Cornel is oblivious. He flings her back on the bike while he ransacks the house but Judith finds her inner courage and tears herself away from the bike as it electrifies the whole room and Cornel in the bargain. He's forced to deactivate the bomb and she leads him in a deadly dance around the kitchen. She uses Alexa to turn off the lights making the battle more even but Cornel opens the fridge for light and gashes her with a knife. Judith, summoning some hidden strength, refuses now to be cowed by the blood as her friend Susy appears and Judith realizes she too is in on the plot.

The local cop comes back but is killed by Cornel. Judith chokes Cornel with the money but hesitates to finish him. Susy then shoots Cornel, takes a shot at Judith, misses, and, close enough for Judith to smell the cordite, moves in for the coup-de-grace.

CADENCE.