Sad Captain, No Action

Herbert was sad. Speak with him in the Barracks.

NPC: Herbert

Completed

I found out why Herbert is sad. He wants his romance novel.

Comes after

First... Sludge? — Win my first battle against the zombies.

Leads to

Wharf Rats — Ask the mysterious person at the Dockside Club about a romance novel.
Herbert and? — Procure the Romance Novel through a mysterious person in the Dockside Club. Then bring it to Herbert in the Barracks.