When Preston Calls

When Preston Calls is an overseer quest and part of the A Settler Needs Your Help multi-stage questline in Fallout Shelter.

Walkthrough
The dwellers must make their way through several rooms of mole rats to reach the 4th room of the 3rd and final floor. Then they must kill the mole rat brood mother and the mole rats guarding her. Then they must go next door to find the settlers.

Once they have found and questioned the settlers regarding Preston Garvey's whereabouts they are free to leave.