If you’ve been called to Netflix’s new limited series “Sirens,” you might be wondering about that shocking ending. The five-episode “Sirens” (now streaming) introduces viewers to the elite world of Michaela Kell,

Fahy finds her footing and becomes the show’s moral center. She even holds her own in freckled face-offs with Julianne Moore, who plays Michaela, the spiritually seeking, demanding billionaire’s wife ...