The Signal

I recently watched the movie The Signal and was pleasantly surprised by the overall plot and ending of this sci-fi thriller.
The movie begins with Nic, his girlfriend and his best friend on a road trip to take his girlfriend to California.

They decide to take a detour to an isolated area to track down a hacker they have been following online.

A signal sent out by the hacker leads them to an abandoned house in the desert. After entering the house there is a scream from Nic’s girlfriend, who had remained in the locked car.  Nic and his friend rush out to rescue her, but suddenly everything goes dark. Nic regains consciousness – only to find himself in a waking nightmare.