Michelle Monaghan Plays Twins Whose Carefully Shared Life Gets Derailed in "Echoes"

"There's something you're not telling me," begins the trailer for Netflix's newest original series, "Echoes." The mystery thriller — out next month — tells the chilling story of Leni and Gina, twin sisters who share their two lives, families and all. But when Leni goes missing, the sisters' perfect double life is brought to its knees, and the audience is left trying to piece together the real story. Haunting clues like a book that reads, "You get both lives. Choose," and a screen that says "I know everything," continue to mystify Leni's disappearance. Was this a murderous act? Is Leni really gone at all? And above all else . . . did she ever truly exist in the first place?

The sinister storyline is brought to audiences by Brian Yorkey, the creator of "13 Reasons Why," and producer Quinton Peeples. Vanessa Gazy, best known for her work with the Australian series "Eden," is both the writer and creator behind "Echoes." She will serve as an executive producer, along with Yorkey and Peeples. Read on for everything we know so far about the series, and make sure to check out the official trailer to see if it sparks any preliminary theories.

click to play video

"Echoes" Trailer

"Echoes" Plot
Netflix

"Echoes" Plot

Leni and Gina are two sisters who share everything. According to the film's description, "Since they were children, Leni and Gina have secretly swapped lives, culminating in a double life as adults: they share two homes, two husbands, and a child." When Gina vanishes, this massive secret is finally put at risk.

"Echoes" Cast
Netflix

"Echoes" Cast

The upcoming series features a star-studded cast, including Michelle Monaghan as both Leni and Gina, who fans might recognize from her work in "Mission Impossible." Matt Bomer and Daniel Sunjata are also shown in the trailer, playing the twins' husbands. Ali Stroker, Karen Robinson, and Rosanny Zayas will have major roles in the miniseries, as well.

"Echoes" Release Date
Netflix

"Echoes" Release Date

"Echoes" will be available to stream on Netflix starting Aug. 19. All seven episodes will premiere at once.