The physician Peter Blood is unjustly arrested for treason under unfortunate circumstances, and sold into slavery in Barbados. In the beginning of the book, before the trial, he doesn't even take sides in the ongoing political debate, but the circumstances changes him. When he and the other slaves escape the sadistic Colonel Bishop, they are desperate and adapt to their new life.
Spoiler's alert!
This is pure entertainment, and I really like the main protagonist for his sharp-witted, arrogant and ironic manner and the way he treats his pompous superiors and other people of high rang who think themselves important. When he loses his motivation, when Miss Bishop calls him a thief and a pirate, the only thing which will set him straight is a condescending glance from the M. le Baron Rivarol, and he is back in business. If he is going to be a thief and a pirate, he is going to be an excellent one.
One minor problem I found a little irritating is that the pirate museum in Nassau states that pirates had a certain codex to follow, and that included treating women gentlemanly. Either Nassau has it wrong, or Sabatini had a strong imagination, because most pirates in the book, except the main characters, seemed morally detached. Other flaws I found bothersome was in some of the encounters at sea where the victories seemed just a bit incredible. A third thing worth mentioning is Peter's somewhat naive characteristic, but this latter complaint might be a rather good description of a man, whose destiny forces him to change into someone he doesn't want to be. Peter isn't fit for piracy, but with a dominant authoritative manner and brains sharper than all the governors of the islands, he succeeds, never-the-less.
Even though Captain Blood is entertaining and adventurous, it has other qualities as well. It describes the social classes and conventions of the time, as well as the less fortunate states. Slavery and piracy were just different sides of the coin of unfortunate destiny back in the 17th century, the one not so different from the other. Both are a kind of imprisonment and detachment from the world, and when forced upon you, it's already too late to do anything about it to justify or redeem yourself. And despite Peter trying to come back to a normal life, prejudices, greed and jealousy in other men prevent him from reaching that goal, until the last chapter. What saves him in the end has ironically nothing to do with a change of mind by those men, or some agreement between them, but purely that the political alliances of the Glorious Revolution shift, and Peter goes from traitor to respectable in a matter of hours. This emphasizes the fact that our perception of the world, our view of right and wrong depends almost entirely on our surroundings. Peter is the exception, but it's only because he is open-minded, challenging and without much prejudice. This reminds me of Edmund Dantès in The Count of Monte Cristo.
What I like best in this adventure novel is that Peter Blood maintains his honor, dignity and moral throughout the book, despite being treated unjustly, and that his strong-minded persistence pays off.