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Sydney, who's father is a Captain in the navy and uncle an Admiral thinks that he might like to be a doctor. Syd runs away from home but on his return he realises that he does really want to be a naval officer too. Eventually Syd's father is appointed to command the Sirius and is invited to take Syd with him as a midshipman. The book goes on to describe Syd's early days in the Navy, and then an episode when he finds himself in command of a naval party holding a rock in the Caribbean.