Dourado

Dourado
(Dane Maddock #1)
by David Wood (2008)

A sunken treasure. An ancient Biblical artifact. A mystery as old as humankind. The Portuguese brig Dourado sank off the coast of Indonesia, losing its cargo of priceless treasures from the Holy Land.

Back to the start of the series. This comes off a bit like a Nancy Drew adventure. Still a good read, but a lot of the subject matter was very specific to the USA and it’s war of independence.