This is a TV movie I saw years ago. I think it was in the 90’s. It is about a woman whose son disappears. She believes he is alive and won’t give up looking for him. There is a cop who works the case. He thinks she is cracked but he has a son about her sons age and he feels for her. Eventually the son is found alive. A man who needed someone to stay with his old, sick mother so she wouldn’t be alone while he worked had kidnapped the boy and taken him to another town.