Dare ... or bigger dare?

Truth has no place in an elaborate, social-driven, voyeuristic mobile game in Dave Franco), making her try on an expensive dress, getting at tattoo, etc.

But then, the game begins taking a darker turn, as their identities are stolen and their money taken — with watchers egging them on.

The trailer looks like a thriller in the vein of "Unfriended." It's got Roberts and Franco as the leads, constant use of smartphones, and the participation of a mostly invisible online audience. Horror's gone millennial!

"Nerve" opens in theaters July 27.

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