White Lies (S01E05)

When a clandestine messenger brings unexpected news from outside the city, Ariadne calls on Jason and his friends to help guide her to the source. Yet leaving the citadel without raising the suspicions of the Queen seems an insurmountable task, especially with the revelation that it is Ariadne's exiled brother Therus who has sent for her. As Heptarian and the King's guards close in on his hiding place, Ariadne must decide where her loyalties lie, in Atlantis or with her royal sibling. But Therus is determined his sister learns the truth behind his exile, exposing a plot that could overshadow the power of King Minos and bring the royal family to its knees. (BBC)