Fire on the Moon. V. J. Banis

Jennifer's dream vacation in sunny Portugal has suddenly turned into an unending nightmare! The two brothers she encounters are bound by the same strange family heritage: a fascination with fire. Jennifer is attracted to both Neil and Philip Alenquer, but one of them is lying about the tragedy that has taken place in their castle overlooking the Atlantic. Philip claims that Neil had set the blaze that killed Neil's young wife after he'd discovered her in Philip's arms. Neil maintains that Philip had started the blaze, and he fears that Philip's insane pyromania is putting all their lives in danger. Jennifer doesn't know which of the brothers to believe, but when the villa she's staying burns to the ground, she knows that she's become the next target of an obsessed killer! A thrilling gothic suspense tale.