This is the mission that introduces the player to the enclaveThe Grange. For some reason, this mission shares its name with Stranger in Trouble, a repeatable mission that requires player to defend an enclave member against a zombie attack.
After receiving this mission's notice through Lily, the player can proceed to the map marker.
At that spot, Bob Macklin and Quentin Barnes are discussing about Jack Ferris, who is still missing. Talk to one of them and agree to help. A few markers will appear on the map marking the potential search locations.
After locating Jack, drive all three of them to a new marker, which is their home base, The Grange. Their leader, Becca Collins, greets them gruffly and chides Jack for risking the security of the enclave.