Young Diana, The by Marie Corelli (1855 - 1924)

Poor Diana May. Her fiancé has jilted her, her parents think she is an encumbrance and no one recognises her intelligence. She seems destined to remain unloved, unappreciated and unpaid - until she decides to take control of her life. It all begins with an advertisement for an assistant to an eccentric scientist with a hidden laboratory in Switzerland... - Summary by Newgatenovelist