The Betrayed by Irina Shapiro

1588. When Rafael de Silva’s ship is smashed on the rocks off the coast of Ireland, he must find a way to get by without access to any resources or help from the locals, since being apprehended will result in certain death for a soldier of the ill-fated Spanish Armada. Terrified and half-starved, Rafael gets help from an unexpected source, but safety is just an illusion, and love is a liability when Rafael’s very survival depends on keeping the secret of his birth from being discovered by those closest to him.
2015. Called upon to unearth the remains of a brutal crucifixion, Quinn must delve into the aftermath of the Spanish Armada’s fateful defeat, but as she tries to decipher the secret the victim took to his grave, she discovers that there are secrets much closer to home, and that the twin sister she couldn’t wait to be reunited with is not quite what she expected.