A member of Blake's Wrath, Judith Faber (Codenamed Rapier) (circa 3030 – 3067) allowed herself to be captured by the Clans which ultimately allowed her to discover the location of the Clan Homeworlds.
As of 3052 Judith Faber was an Adept Rho/Rho in ROM's Blake's Wrath, ComStar's elite special forces unit when Precentor Martial Anastasius Focht made the batchall for the Battle of Tukayyid. Faber was one of a number of Wrath agents who agreed to take part in a high-risk but vital plan, to deliberately lose in combat against the Clans in an attempt to be taken as a bondsman, to infiltrate the invaders to discover vital intelligence and possibly the holy grail: the location of the Clan Homeworlds. 
Faber was seeded among the Com Guard Level IVs facing Clan Smoke Jaguar's Beta Galaxy in the Racice River Delta, defeated and taken as a bondsman by Star Captain Trent. Befriending and eventually earning his trust, she convinced the increasingly disillusioned Trent that his Clan was dishonorable and corrupt, and convinced him to gather data on the Exodus Road and defect to the Inner Sphere. 
Upon her return to the Inner Sphere, Faber returned to active duty with Blake's Wrath, receiving a prized Clan assault 'Mech. Reports indicate Judith Faber was supposedly killed engaging Word of Blake forces in the Chaos March prior to the Jihad in 3067, but ultimately neither her body or her 'Mech were ever recovered.
Judith piloted a CRB-27 Crab during the Battle of Tukayyid, sacrificing her 'Mech to allow herself to be taken captive. After her return to the Inner Sphere and resuming active duty with the Wrath, she received a captured Clan Marauder IIC. 
|“||"The key to spying is to hide the knowledge that you're a spy even from yourself. Remember, when when you think you're alone, you almost never are."||”|
|“||Sometimes Judith goes so far undercover, even she doesn't realize she's one of our agents.||”|
- Technical Readout: 3050 Upgrade, p. 198 "CRB-27 Crab"