Brotherband Bk4: Slaves of Socorro by John Flanagan.
A thrilling action/adventure book from the author of the Rangers Apprentice series. This time Hal and his Heron Brotherband crew take their innovative ship with the triangular sail to protect the seas off the coast of Araluen, the kingdom where the Rangers come from.
Their job is to stop smuggling and piracy but they come across a bigger evil – slavery.
Tursgud has never gotten over Hal beating him in the Brotherband contest with his team of outcasts and a superior ship that Hal had built and conceived himself. This time Tursgud and his bunch of Skandian outlaws raid a village and take hostages to the slave market in Socorro a place akin to the Barbary Coast in North Africa.
Accompanied by a tough but beautiful girl Lydia and one of the Rangers from the King of Araluen Hal and his crew pursue Tursgud to get the slaves back. Hal has with him his mentor Thorn, a massive viking type warrior with a hooked arm, twins Ulf and Wulf who squabble like a couple of turkeys and the gentle giant Ingvar.
To get the slaves out they have to try to sell Ingvar as a slave in Socorro. This leads to thrilling action. You will not be able to stop reading the last 120 pages. One of the strong themes in this book is the emphasis on team work and leadership.
For intermediate and junior high school students. Book 5 is already out for fans.