“911 Nightmare” (**1/2 out of four) was a reasonably tense and engrossing thriller about a 911 call operator (Fiona Gubelmann) who is disgraced and terminated after mistaking a real murder for a prank call; upon her termination, she sets out to clear her name and sort out the various clues and find the real killer. Brisk pacing and strong and believable performance from Gubellman help cover up various plot holes and illogical plot points. Worth checking out but still- this is no match for “The Call” with Halle Berry which was similar but much more striking and chilling.