Rainstorm by Jesse Jacobson

It may be Rainhorse’s most harrowing adventure yet.
Rainhorse is called in to help “Wolf” Steel and “Bootstrap” Saunders find Carmen, the missing sister of their SEAL brother, “Chili” Davis. Carmen was kidnapped by a notorious sex trader, Benjamin Flagg, who intends to sell her into prostitution in Tenancingo, Mexico.
Kay Bennett, a beautiful woman, who seeks her own missing sister, comes forward with information. Sparks fly between Kay and Chili, but they must set aside their feelings until their sisters are safe. Rainhorse and the SEALS face insurmountable odds to challenge and defeat Flagg and his militarized organization.