Title: Pirates
Description: Taffrail was the pseudonym of Henry Taprell Dorling.

The cover says A Novel of the China Seas

First published October 1929, with  seven further  reprints through to February 1941,  with probably  more.

From an AbeBooks description:
A naval adventure based on Royal Navy encounters with pirates in the Canton Delta. The narrative focuses on authentic sea combat and maritime tactics.

Jacket artwork by Hastain.
Subjects: Royal Navy, Pirates, Pirates - Canton delta, fiction, fiction - naval adventure