A sailor initially too poor to marry Johanna, but returns to London wealthy after his voyage. Todd lures him to the shop and attempts to kill him, but Mark escapes with help. He later returns in disguise to confront Todd and successfully rescues Johanna from the burning building.
Todd treats Mark as a rival for Johanna and attempts to eliminate him.
Todd lures Mark into the barbershop, attempts to kill him, and later attacks him during the fire.
Johanna and Mark maintain a loving relationship despite separation and danger.
The plot states that Johanna and Mark are in love, and they kiss after Mark rescues her.
Tobias unintentionally helps Mark communicate with Johanna.
While disguised, Mark sends Tobias to tell Johanna where he is.
Mark relies on Pearley as a trusted sailor companion.
Pearley is identified as Mark's fellow sailor, and he helps Mark escape from the cellar.
Nan provides the information that enables Mark to save Johanna.
Nan informs Mark and Pearley that Johanna went to Todd's shop, prompting their rescue mission.