India, Aug. 21 -- A retired couple is desperate for answers after their son disappeared without a trace from Burlington, Vermont. Sandy and Jesse Harper have been looking for their son, Christopher Harper, for months, who went missing last November.

Investigators said earlier this year that Christopher's family has not heard from him for months, and is worried because they believe this behavior is uncharacteristic of him as he contacted his family members every day.

"This is very uncharacteristic of Chris, as he normally contacts his family daily," police said, according to mychamplainvalley.com.

According to police, investigators have carried out multiple interviews and court-approved searches of phone, financial and social media acco...