A Trip to Bath requires the Endearment base game.

It seems as though some relative or other is always planning a stay in Bath for health benefits. You, my dear, are invited to join them! Boost your traits with aid from supporting characters, and collect dowry, social standing, and connection tokens for special set bonuses. 

A Trip to Bath adds new settings depicting Regency era Bath, and one new heroine from Jane Austen's The Watsons, which was written while she lived in Bath.