As Calder and Tosh wrestle with the revelation of Annie's past, Noah offers a cryptic clue about the night she was killed.

Cast: Jimmy Yuill, Bridgitta Roy, Alison O'Donnell, Angus Miller, Tara Lee, Robert Jack, Ashley Jensen, Ian Hart, Steven Robertson, Lewis Howden, Vincent Regan, Johannes Lassen, Nathalie Merchant, Ines Høysæter Asserson, Macleod Stephen, Ross Anderson, Andrew John Tait, Jacob Ferguson