The Stone House is where Prentice was being nursed back to good health. after his rescue from Exile. And when they didn't know why he sank in shadowvapor. Wylie was also there for a time (after he escaped his kidnapping), though he was later moved to Alluveterre. After Calla finds out that Sior, Lur, and Mitya are quarantined, she brings Sophie, Keefe, Biana, and Dex here. Once there, Sophie sees Blur, Magnate Leto, Tiergan, and Wylie all there.