"There was a female in the background that sounded like she was pleading for mercy or crying for help."

CHP dispatchers got a 911 cell phone call just before 4 a.m.

With help from the Sheriff's Department and police, they traced the call and helped rescue the woman.

"When they rang the door bell to the suspect house, the female started screaming louder," Manteca police Ofc. Rex Osborn said. "Officers could hear it outside, so could the dispatchers on the phone. So we knew we were at the right spot. Officers kicked the door and went in. Both sheriff's deputies and manteca police, went in and searched the house, and actually found the suspect actively assaulting the female."

Police arrested 30-year-old Jermaine Williams, for kidnapping and rape. Neighbors said he lived with his parents in a Pestanta Avenue home.

The sheriff's department figured out the call came from Manteca. And with help from cell phone towers, dispatchers were able to pinpoint exactly where that call was coming from.

From the time the victim called 911 on the cell phone, to the time officers knocked on the suspect's front door, was just eight minutes - eight minutes that probably seemed like an eternity for the victim.

Investigators say at one point, the woman was locked in a closet after the suspect assaulted her repeatedly over four hours.

Law enforcement said the woman is the real hero in all this, keeping her wits about her and thinking to call for help during her ordeal.