In joining the exclusive group as Michaela's assistant -- whose tasks extend beyond traditional administrative duties to include sleepovers and help with sexts -- Simone turns her back on her family in Buffalo,

Julianne Moore, who stars as Michaela in the series, tells TODAY.com the series started as a look at the Greek myth of sirens — winged creatures, half-birds and half-women, with songlike voices capable of luring sailors at sea to their demise.