A Chance Meeting: A Pride and Prejudice Variation

In Jane Austen€s Pride & Prejudice we are told that Fitzwilliam Darcy arrived in Ramsgate in time to stop his sister€s elopement with George Wickham, but what caused him to go there unexpectedly?

Darcy met Elizabeth Bennet while she was shopping with her Aunt Gardiner. It is Elizabeth who suggests he travels to Ramsgate to visit his sister. Darcy will always be grateful to her for that advice.
Meeting Elizabeth before joining Bingley at Netherfield can only help in their budding relationship, or does it? There are some who, for differing reasons, are unhappy with Darcy€s growing friendship & admiration for Miss Elizabeth Bennet and they are determined to put a stop to it.