S6, E5: Julian Shepherd, who has most of his money invested in Charles Edmonton's new invention, is found drowned, and there seems to be evidence that he killed himself due to money problems. Then a villager who has been stealing peregrine falcon eggs from Charles's widow is also found dead. Elsewhere Mallory Edmonton is keeping her husband sedated and under lock and key in the attic. Charles dies, too, but against every suspicion he died a natural death. Barnaby and Troy must act fast if they want to uncover what really happened.