That Jalopy Is Sure Dilapidated: The Third Gabrela Oman Series

At work at Cherie Books, in Paris, France, Gabrela Oman Monford is approached by a Russian woman-worker, named, Loraine Gustoff. She's worried her younger sister, Natalia, and her boyfriend are leaving her parents. Could she and the group find her. She would go along with them to Russia. Gabrela agrees having no-idea what this Russian woman has up her sleeve.