Go to the guild and choose the "Attack Orchard Farm" quest. Make boasts if you want, then head to Greatwood Entrance. You can enter Orchard Farm from here which will start the quest right away.
You need to protect the Bandits as they steal the 3 crates.
Go down to the barn, killing the 3 guards on your way. Guards use a mix of ranged and melee combat, so be careful.
When you get to the barn, one of the bandits will steal one of the crates, follow them back to the entrance.
The next two crates are exactly the same, so just do what ever worked the first time and you got it.
Once the last crate has been stolen, Whisper will appear and ask you to hit her with a Flourish. Hit her once, this will charge up your attack and then just hit her with (that's a Flourish). After that just defeat her normally. When she falls, the quest is done.
Beating this quest earns you:
- 3000 experience
- 1000 gold
- 400 renown
- 1 x Whisper's Brooch