Sparks police are looking for the man who knocked on a woman’s door and robbed her at gunpoint. Officers were called to the home on Serendipity Court off Vista Boulevard just before 11 o’clock last night. According to the woman, the suspect knocked on her front door asking to speak with someone who didn’t live there. During the conversation, the suspect pulled out a handgun and demanded to be let inside. Once inside, the suspect took a few valuables and left. The suspect is described as white, in his 20’s, with a thin build.