Rachel Deery was living in the Soviet Union in the early 1990s with her husband. a lawyer who was working there, witnessing that country’s chaotic times as she learned to speak Russian and became a freelance writer. The couple had two children, returned to America, then went back with them to Russia in 1998, after the country’s economic collapse. Deery, now a board member of the Mattapoisett Free Public Library, will speak of those times, which she called “a transition to reality check,” as the concluding speaker in a free lecture series on Russian history. The series, presented at the library by the Mattapoisett Historical Society, will run on consecutive Saturdays from 2 to 3:30 p.m., starting this Saturday. Deery’s talk is scheduled for Feb. 16. For information, call Susan Pizzolato at 508-758-4171, or visit www.mattapoisettlibrary.org.