Definitely not. Unhinged (2020) is a made-up story. The plot and characters were crafted by the filmmakers to thrill and engage the audience rather than being drawn from real-life events.
It depends on your definition of a 'real story'. 'Unhinged' might incorporate elements from real life, but it's likely a blend of fact and fiction to create an engaging narrative.
An unhinged novel often features erratic or unpredictable characters. Their actions might not follow the normal logic. For example, a character could suddenly change their life goals without any clear reason. Also, the plot can be wild and all over the place, jumping from one extreme situation to another in a short span.