The Treasure of Peril Island

Young, penniless Jack Drayton lives on a barge, anchored in the Thames River in 1903 London. One night, Jack comes to the assistance of an old man, who claims to be the infamous pirate Black Juan Gaskara, on the run from several men who want him dead. Before Juan is murdered by his old enemies, he gives Jack a cryptogram that reveals the treasure’s location.
With his best friend Hector, Jack sets out to claim the treasure before Gaskara’s enemies do – that is, if he can stay alive long enough. $0.99 on Kindle.