Tell Me Why: Chapter Three

Consumed with guilt and anxiety over Mary-Ann's death, Alyson's mental health deteriorates, leading to a severe panic attack. After she recovers, Alyson visits Sam to ask him about their potential familial ties, but discovers instead that an old photograph in his possession reveals a hidden loft above the barn. The twins regroup to investigate the loft and find a room of complex puzzles, which they solve using the Book of Goblins. They discover that Mary-Ann's fairy tales were actually metaphors for her troubled past: born to an overbearing family, she fell pregnant and fled to Delos Crossing to raise her baby, a son named Leo, who did not survive. The twins find a picture of their late half-sibling, along with a letter from Mary-Ann which is addressed to them. The twins realize that Mary-Ann had suffered a mental breakdown over her fear of social services taking away her surviving children. The twins deduce that the unknown man on the boat, and their biological father, was in fact Tom Vecchi, Tessa's husband. After the twins confront Tom, the player as Alyson must decide whether she believes that Mary-Ann planned to kill herself and her two children, or that she had planned to kill only herself when Tyler interrupted her as alleged by Tom.
Depending on Alyson's choices, two main concluding scenarios are presented:
If Alyson chose to admit to Eddy that she killed Mary-Ann and/or took Tom's memory of her mother's death, Tyler returns to the house one last time, with Alyson in Juneau and receiving therapy.
If Alyson never told Eddy that she was responsible for Mary-Ann's death and she believes that she saved Tyler from their mother, Alyson opts not to sell the house and moves in by herself and writes a new chapter in The Book of Goblins.