Book two of the Adventures of Jonathan Moore Trilogy. Reunited with his father, Jonathan Moore soon leaves the comfort of London for the Caribbean. However, with the arrival of another midshipman holding a severe but unexplained grudge, life aboard HMS Danielle is anything but pleasant. Why are the new midshipman his enemies? Who is stealing from the ship's stores? Why must Jonathan and his best friend, Sean, sneak into a heavily guarded Spanish fort to commit some burglary of their own? To succeed, Jonathan must capture a stolen British ship, solve the mystery of a surprising stowaway and defend his honor and his life in a fierce duel against a murderous adversary. Alone and outnumbered, the crew of the Danielle engages in a violent battle on the seas south of the farthest tip of Africa. Only Jonathan, Sean and an unexpected guest can turn the tide of the struggle by unlocking the secret of a mysterious island and re-igniting the ferocious power of the Castle of Fire!