Xzar's "Clone" is a part of TDD, as a device to enable Xzar and/or Montaron to be in your party.
The "Thieves hold a knife to Jaheira's throat" thing is a part of the Jaheira Romance.
"Jaheira returns to Harper Hold" is a part of Jaheira's Harper quest.
Apart from turning someone like Minsc into a Human Roadblock as LennonCook suggested, the only way back into the Harper Hold is to have Jaheira in your party--unless you've already whacked Galvarey, in which case the door will be unlocked, and stay that way.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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