Richard Harding Davis 
The Princess Aline [PDF ebook] 

He was within two feet of the girl who had been called ‘Aline.’ She raised her head to speak, and saw Carlton staring open-eyed at her. She glanced at him for an instant, as if to assure herself that she did not know him, and then, turning to her brother, smiled in the same tolerant, amused way in which she had so often smiled upon Carlton from the picture.
A young artist goes on a wild goose chase, in hope of meeting and falling in love with the princess. However, he instead finds himself in love with his travelling companion.
It’s a short, funny, romance story about a young artist who traipses about Europe trying to meet his true love. It honestly feels like a period Rom-Com. After seeing a picture of a princess of a small duchy in Germany, our protagonist, Carlton, sets sail for Europe to finagle and introductions. Along the way there are chance meetings, missed connections, misunderstandings, and zany antics. It’s a fun, but not particularly serious novel.