BRIDGEWATER — A 20-year-old man with a goatee and a phone full of FaceTime calls is sitting in the Plymouth County House of Correction tonight, accused of pretending to be a teenager so he could expose himself to a string of 12- and 13-year-old girls and pressure them into stripping for him on video.

The alarm went out Tuesday evening at 7:15 p.m., when Bridgewater officers were told that a grown man had been working middle-school-aged girls in town — first in person, then on FaceTime — by feeding them the lie that he was 17 himself. By 4:42 p.m. Thursday, Graham was in the back of a cruiser. Less than 48 hours from tip to takedown.

What detectives say they uncovered in those two days is grim. According to police, Graham befriended girls between 12 and 13 years old, presented himself as a 17-year-old peer, and then steered the contact onto video calls where he allegedly exposed himself and pressured the children to strip down for the camera in return.

Detectives Nicholas Chmielinski and Jacob Poulin and Officer Theodore Barbetto built the case in conjunction with the Plymouth County District Attorney's Office, the department said.

Graham was ordered held on $25,000 cash bail and is being warehoused at the Plymouth County House of Correction in Plymouth pending his next court date. The investigation, police said, is still wide open.