Part 1: A UBS insider blows the whistle on Swiss banking.
Part 2: Feeding the UBS obsession with North American wealth.
Part 3: Meet Bradley Birkenfeld's biggest client, and nemesis, US billionaire Igor Olenicoff.
Part 4: UBS whistle-blower pays a high price for tipping off US investigators.
Part 5: As whistle-blower is jailed, perpetrator of massive tax fraud gets backdoor bailout.
But few think the agency will have the same success it did with UBS.
