Blackwater

When Jack Rogan decides to return home from years of gambling on the Mississippi riverboats, he makes a mistake by taking what he thinks is a shorter, faster route back to Texas. The Louisiana swamplands are teeming with danger, not least Gaston Savoy, Homer Lamb and their kin from the secluded waterside community of Whistler. Captured and stripped of money, guns and his mare, Jack is compromised into making a deal with his captors. Soon, he discovers the real reason for his internment - and just what is expected of him.
Blackwater by Abe Dancer