You can meet Peter in Quarry End. Chat with him. He will tell you that he once kept a flower shop, and an elderly woman constantly came to him. Then she went missing and he wants you to find her house. Agree to help.
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Follow the marker. Closer to the mountain with a yellow surface (chemical reagents), look for a house with a glass greenhouse (outbuilding). Go inside, go into the glass annex itself and look around. To the right, a woman's corpse sits in a chair. Examine it and leave the flower. There is a note next to it. Read it. Turns out it's Peter's mother. Return to him and tell the truth.
The action game also received a content update.