This sea captain was no other than Norman, who had been picked up off his plank, and fell in love with, and was loved by, Miss Violet.
A short time after Violet's arrival at her aunt's the captain came to pay her a visit, his ship anchoring off the coast, near Lady Arundel's residence.

By a singular coincidence, that rogue Gaussen's ship anchored in the harbor too.

Gaussen at once knew his man, for he had "tracked" him, (after drowning him,) and he informed Sir Maurice Beevor that young Norman was alive.
Sir Maurice Beevor informed her ladyship.

How should she get rid of him?
In this wise.

He was in love with Violet, let him marry her and be off; for Lord Ashdale was in love with his cousin too; and, of course, could not marry a young woman in her station of life.