Dangerous Summer — Carolyn Hart / Carolyn G. Hart

Nan Russell needs some excitement. At least, that's what Nan tells herself as she books a summer study tour of Europe lead by distinguished professor Dr. Yates. But Nan will get far more excitement than she bargained for when a series of bizarre and dangerous events embroil her and her study group in a criminal plot to abduct Dr. Yates. But what could an organized criminal want with a professor? And can Nan stop them before they want her as well?