At the Nightingale Express, a first-class ticket stub went missing from the conductor's pouch. The train staff who were there each either always tell the truth or always lie — there is no in-between. From their statements alone, work out which is which.
Points for solving; rating never moves in free play.
At Meridian Hill Observatory, the comet photographs were taken from the darkroom a day early. The astronomers who were there each either always tell the truth…
At the Marigold Bakery, the sourdough starter was fed with the wrong flour. The bakers who were there each either always tell the truth or always lie — there…
At the island of Verra, the harbour bell was rung in the middle of the night. The villagers who were there each either always tell the truth or always lie —…