The Service Elevator by Vasimraja Bhavikatti

Milind Kabra, a thriving management executive and a prominent figure in India's IT industry, unexpectedly finds himself alone in an elevator one day. However, his situation takes a perplexing turn when an unfamiliar and enigmatic man engages him in conversation, promptly assuming control of the elevator. This unsettling encounter shatters Milind's belief that he's merely trapped due to a malfunction; instead, he comes to the stark realization that he's being held hostage by this mysterious individual.
In the confined space of the elevator, Milind is compelled to confront his past actions and choices, leading to the revelation of concealed facets of his life. Moreover, this tense situation compels him to expose disconcerting truths about the darker underbelly of the IT industry.