Texas Rangers Abroad is a combination of three separate stories about Texas Ranger Wayne Stephens and Scotland Yard Inspector Caleb Jones. They first meet in the streets of London in 1885 when Stephens stumbles into a case Jones is working on in the predawn hours. With doubt surrounding the validity of Jones's claims, the ranger agrees to help him solve his case while pursuing another dangerous criminal. The only question is, who will catch their man first?

Next, after two years of writing to his new good friend and colleague, Stephens gets Jones to bring his wife to Texas for a visit to his parents' ranch near San Antonio. The peace and quiet lasts for about five minutes until a sheriff asks the ranger for help, and Jones has to assist the deputy in their absence. With robbery, murder, kidnapping, and a surprise relative in attendance, this vacation is anything but peaceful.

Lastly, Stephens is ready to retire from the rangers after twenty years of service. He wants to have a family and stay close to home after one last patrol, but he doesn't have time to unpack before Jones recruits him for one last case. An adventure awaits them in the southern hemisphere where English subjects live in a Wild West atmosphere. A fortune in gold and the future of a nation hang in the balance as the two lawmen go farther than ever before to serve justice.