Deep in Coruscant's seamy criminal haunts of slum district G17, Anakin Skywalker and Ahsoka Tano weave their way through the dregs and downtrodden seeking out Car Affa, a Weequay war profiteer known to sell Republic weaponry to the Separatists. Anakin confidently strides into a bar while Ahsoka waits outside, and she is knocked over by the stream of panicky bystanders fleeing the establishment once "Jedi business" gets underway.

As Ahsoka dusts herself off, she sees that her lightsaber is missing. She catches a fleeting glimpse of a yellow-skinned Patrolian as he disappears into the general mayhem and bustle of the lower levels. Ahsoka is mortified -- her lightsaber has been stolen! Anakin emerges from the bar with Car Affa in custody, but Ahsoka does not reveal her loss to her Master.

Back at the Jedi Temple, Ahsoka visits the Jedi Archives, searching through city databases to find any clue to the thief's identity. The helpful Jocasta Nu directs Ahsoka toward the aged Jedi Master Tera Sinube, an expert on the Coruscant underworld. Ahsoka's confidence is hardly bolstered by the fact that Sinube is fast asleep at his library station.

Ahsoka rouses Tera from his slumber, and he is eager to help the young Padawan. Based on Ahsoka's description and recounting of her encounter, Tera Sinube narrows down the suspect to Bannamu, a petty thief with a hangout in the slum district. Tera volunteers to accompany Ahsoka to the underworld, since it has been years since he has had an active assignment.

Master Sinube and Ahsoka venture to a noodle shop run by a surly Quarren named Lauli Wahlo. Ahsoka asks around for a lightsaber, and Wahlo and his Twi'lek associate Jan Dez claim they could get one for 20,000 credits. Ahsoka and Sinube reveal that they are Jedi, and the nervous fences point them to the nearby Spider Arms Hostel, site of Bannamu's bolthole.

Mind-tricking her way past the hostel's front desk, Ahsoka continues her search through the dilapidated corridors of the Spider Arms. Sinube advises that she calm down, for in her anxiety, she is missing clues in the Force. Ahsoka centers herself, and senses which room belongs to Bannamu.

Ahsoka barges into the dingy room and corners Bannamu, demanding to know where her lightsaber is. Bannamu reveals he sold it to Nack Movers, a dangerous killer in the underworld. Ahsoka's hopes plummet -- her weapon may turn into a murder weapon due to her negligence.

Ahsoka rushes to a condo complex where Nack Movers resides. She is shocked to find the entrance to Nack's condo sliced open, and Nack dead inside. Cowering in the shadows is a slight female alien named Ione Marcy. She asks if the men who killed Nack are gone, claiming that she found the grisly sight when she came home. Tera Sinube senses her terror, but it contains a trace of something else.

Ahsoka investigates the bedroom when she is suddenly sucker punched by a lithe female alien, Cassie Cryar, a Terellian jango jumper. Cassie wields Ahsoka's lightsaber, but she is unable to activate it. Cassie leaps through the bedroom window, landing on an adjacent rooftop, and Ahsoka gives chase, radioing her status to Sinube. The chase runs across rooftops and hovering holographic billboards.

Sinube is surprised by Ahsoka's report that her quarry is female, as it does not match Ione's story. He continues to question an increasingly uncomfortable Ione. Sinube contacts the authorities, and when the police droids arrive, Tera accuses Ione of being an accomplice in Nack's murder. Ione bolts, jumping to a waiting airspeeder before the droids can apprehend her.

Marcy speeds into the Coruscant skylanes and intercepts the fleeing Cassie Cryar. They are indeed partners in crime, and they speed away, leaving Ahsoka stranded high over the cityscape. Cryar still has Ahsoka's lightsaber.

Tera Sinube pilots a borrowed police speeder bike and picks up Ahsoka from her dangling predicament. He soars along -- at a leisurely pace -- through the skylanes toward a nearby train station. Tera isn't rushed, for he knows where Ione is heading -- he has affixed a tracking device on her.

At the station, as the fugitives try to lose themselves in the crowd, Cassie spots the beacon on Ione's shoulder. She smashes it, but the Jedi have already arrived. Police droids surround Ione, but Cassie runs. The departing train doors are shut, so Cassie leaps atop the train as it speeds away, and Ahsoka gives chase.

Ahsoka and Cassie continue their chase inside the passenger cars. Cassie grabs a Twi'lek mother and child and holds them hostage. Ahsoka offers to exchange herself for the prisoners, but Cassie won't comply. The train stops at its next station, and Cassie pushes the hostages aside as she tries to escape. Tera Sinube, though, has beat them there. He pulls his lightsaber from within his walking stick and disarms Cassie, knocking her unconscious.

Following Sinube's advice, Ahsoka passes on what she has learned. She visits a lightsaber training class in the Jedi Temple, where Yoda instructs a group of younglings. There, Ahsoka offers her lesson of never losing track of a lightsaber.