Master Keaton Vol 1

From the VIZ Media edition

Taichi Hiraga-Keaton, the son of a Japanese zoologist and a noble English woman, is an insurance investigator known for his successful and unorthodox methods of investigation. Educated in archaeology and a former member of the SAS, Master Keaton uses his knowledge and combat training to uncover buried secrets, thwart would-be villains, and pursue the truth... When a life insurance policy worth one million pounds takes Master Keaton to the Dodecanese islands of Greece, what will he discover amidst his scuffles with bloodthirsty thieves and assassins?

Source: Anime News Network Encyclopedia