After purposefully being killed and then revived, they each begin to experience amazing side-effects that improve their lives… but it’s not all positive.
Being dead also has the effect of making the brain enhance the memory of the worst thing you’ve ever done, and before long the protagonists find themselves haunted by their personal demons.
For those unfamiliar with the plot of Flatliners, the story centers on a group of medical students (Ellen Page, Nina Dobrev, James Norton, Diego Luna, and Kiersey Clemons) who begin to partake in dangerous medical experiments in the hopes of learning what it is that really happens after death.