Mystery drama from 2021 (developed by Erica Saleh, based on the young adult novel of the same title by Karen McManus), currently showing on Netflix.
Suspenseful high-school whodunit with well-developed characters, decent acting and good cinematography.
Now that we know (or think we know) who done killed loathsome Simon at the end of episode 8, a Simon says text message throws a cloud of smoke that announces more to come in future series 2.