Johnny Depp Wants to Know Who Killed Biggie and Tupac in First Trailer for ‘City of Lies’ (VIDEO)

Like the rest of the world, you probably didn't see 2015's Black Mass, but it was the last good performance Johnny Depp gave, and certainly his best in over a decade. His new film has the potential to do likewise, depending upon how seriously we're supposed to take the whole thing.

City of Lies is a new film starring Depp as L.A.P.D. Detective Russell Poole, a man who spent twenty years trying to solve the mystery behind the murders of Biggie Smalls and Tupac Shakur. Forest Whitaker stars as a journalist with a vested interest in the case, who approaches Poole to find out what he knows, and why his findings have been suppressed.

The real Poole died in 2015, though he had always maintained that Suge Knight was behind Biggie's 1997 death, and that the mogul had sought the help of members of the L.A.P.D. to pull off the drive-by in retaliation for the death of Shakur a year earlier.

This will be a big year for this story, having just been adapted for TV on the USA Network, and starring Westworld and It's Always Sunny's Jimmi Simpson as Poole. Honestly, give me Simpson again in this movie. He looks a lot more like the real Poole than Depp does. City of Lies hits theaters on September 7.