The Fall of the House of Reardon
Prerequisite: None | Suggested Level: 6
You can start this quest by reading the Notice Board in Lindenvale. Once you do, speak to Dolores just down the path to learn that her childhood manor has been overrun with monsters. Agree to help, then head to the marker on your map - an additional quest starts when you arrive. After the first part of that one is complete, you can return to Dolores to claim your reward.
Ghosts of the Past
Prerequisite: Begin "The Fall of the House of Reardon." | Suggested Level: 6
Something isn't right at the farmstead. Enter the barn, and be on the lookout for tripwires - be aware that you can disarm them too. Head for the back and use the ladder to reach the loft. You'll encounter an old friend up there.
Follow Letho into the yard and take out the headhunters. At this point, you can return to Dolores to wrap up the quest that brought you here, but you should follow Letho to his next confrontation to finish this one first (you'll wind up back in Lindenvale anyway). Ride with him to a mercenary camp and fight another battle to keep this side story going.
After the fight, you'll ride with Letho to Lindenvale. A cut scene will play out, and Letho will go down. Avenge him by taking out the goons that did him in, and you'll learn the truth about this whole scheme and finish the quest.
Contract: The Merry Widow
Prerequisite: None | Suggested Level: 10
You can get this contract from the Lindenvale Notice Board. Do so, then speak to gravedigger. He'll tell you about a creature that plagued the graveyard and stole a child from the village. Head to the graveyard marked on your map and take out the rabid dogs that have laid claim to the area.
Use your Witcher Senses to check the graves; one of them will activate a scent trail. Follow this to find an old hut, then use your Senses to investigate the stuff inside. Grab the skull and return to the graveyard.
Place the skull on the pedestal inside the lone building to summon Mourntart the Grave Hag. Kill her - Necrophage Oil, Yrden, and Quen all work well - then return to the gravedigger to claim your reward.
Contract: Mysterious Tracks
Prerequisite: None | Suggested Level: 20
You can get this contract from the Lindenvale Notice Board too. Speak to the hunter down the lane to learn of something that's been killing wolves in the area.
Head to the search area and use your Witcher Senses to spot some tracks. These will lead you to a tree where the beast left some fur, and this will activate a scent trail. Follow this to find a cave you can't access. Head up the nearby hill and look for a hole into the other end of the cave.
Inside, you'll find a strange scene: a dead fiend and a bunch of tracks. Use your Witcher Senses to examine everything, and you'll realize you're dealing with a chort. Check outside the entrance you couldn't use for some fiend dung, then pick the nearby bushes for come crow's eye. Mix these into a chort lure and pour it at the spots marked on the map.
Head back to the cave to confront the chort. Be prepared for a tough fight, though Devil's Puffballs and Relict Oil will help. Once you've bested the beast, return to the hunter for your reward.