. >> reporter: welcome to sidney's cove, a quiet cul-de-sac in lawrenceville, georgia, 40-miles north of atlanta. a small town where the bells of the first baptist church can be heard in the backyard and dinner time is marked by the rumble of freight trains. it's home to matt and nique leili, their daughters amanda and rebecca, and nique's older daughter alex, from a previous marriage. why all the cameras? matt's in the business. he sells security systems, a tech-savvy, law and order guy who's become a one-man neighborhood watch. we sat down with nique's family. her father doug chatham, her daughter, alex, and sister amy. >> i knew that there were cameras all over the place because, i mean, you know he made a point to -- sort of brag about it, really. it was a -- sort of a source of pride for him. >> reporter: the house seems so tranquil on the outside. matt and nique, both 44 years old, married on valentine's day, together, 13 years. many of them good. she was southern, an accountant, the breadwinner. matt, a transplanted new yorker, called her babycakes. >> nique told me, you know,