The story of a puzzle that at times looks like a conspiracy, but then turns in a completely different direction, is not entirely new, but it is well told. It's a silent episode without much action. But that's also Star Trek at its best. An intensive character study focussing on the doctor and a lot of philosophy about the inner dilemma do not make a fantastic episode, but a very good one. In the end, told a little too slowly ... 20 years before Covid I heard the term "triage" for the first time.