Here are some of his most famous works:
* The Secret of the Sandhills: A novel set on the Norfolk coast, involving smugglers and a lost treasure.
* The Mystery of the Ocean Star: A thrilling story about a ship that disappears at sea and the secrets surrounding its fate.
* The Cruise of the "Keturah": An adventure story about a ship that sails the world, encountering pirates and other dangers.
* The Rover of the Seas: A classic tale about a ship captain who is wrongly accused of piracy.
* The Captain's Daughter: A story of love and adventure set aboard a ship sailing to Australia.
Collingwood also wrote short stories and articles for various magazines, contributing to a wide range of publications like *The Strand Magazine* and *Boys Own Paper*.
If you enjoy adventure stories with a maritime setting, Harry Collingwood is a great author to explore.