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 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 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…
At St. Brigid's Monastery, the orchard gate was left open and the beehives were disturbed. The novices who were there each either always tell the truth or…
At the village of Port Mercy, the prize catch was swapped before the weigh-in. The fisherfolk who were there each either always tell the truth or always lie —…