When a young boy named Toby suddenly collapses, an urgent search for Dr. Baker begins to help Mrs. Taylor, who shows symptoms similar to Toby's rare hereditary disease, erythrosis. Toby recognizes the resemblance between Mrs. Taylor and Lucas, leading to speculation that she might be Lucas' great-grandmother. After administering medicine to stabilize Mrs. Taylor, Toby leaves abruptly, worrying his mother. She urges him to always inform her before leaving. Meanwhile, a DNA test with Lucas' sample is demanded to confirm the family connection, leaving the episode ending on the uncertain link between Toby, Lucas, and Mrs. Taylor.