The new episodes pick up four years after the events of the Season 1 finale, when the unidentified body of an Asian girl washes up on to Sydney’s Bondi Beach. The case seems hopeless until detective Robin Griffin (Moss) discovers that China Girl, as the victim is known, didn’t die alone.
The network wouldn’t release any details about Christie’s character on Monday, except to say that her role is a major one.
Other cast additions include David Dencik (The Borgias, The Girl With the Dragon Tattoo), Alice Englert (Jonathan Strange & Mr Norrell) and Ewen Leslie (The Daughter).
Top of the Lake Season 2 is slated to debut on SundanceTV in 2017.