Charlie Heller (Rami Malek), the mad-as-hell secret-agent geek brainiac at the center of “The Amateur,” is a CIA analyst who works five floors underground at Langley, in the Decryption and Analysis department. There, he’s a master of all things coded and virtual, a surveillance hacker par excellence. Out of the office, he and his adoring business-person wife, Sarah (Rachel Brosnahan), reside in a renovated farmhouse and appear to have the perfect life. So when Sarah, on a corporate trip to London, gets taken hostage by a cadre of terrorists and is killed on the spot, it’s as if Charlie’s entire existence had been wiped away. Since the tragedy was an international…