No matter your choice, he'll basically drag you into the fight so help kill the scouts. Letho explains that only one man, a supposed friend, knew where he was, Louis. Suddenly, men approach the farmstead - clearly no ordinary lost peasants.
Letho explains his situation - after the events that transpired at Loc Muinne, he has been on the run and in hiding ever since as Emhyr now sees him as a threat due to being an 'unnecessary' witness. Once you're ready to start the quest, enter the barn and interact with the ladder to get up to the loft, only to find Letho. After hearing a sound coming form the barn, Geralt decides to investigate. While exploring Velen's countryside near Lindenvale, or taking on The Fall of the House of Reardon contract, Geralt stumbles across a farmstead which is littered with booby traps.