The best romantic suspense books start the way real fear does: a midnight swim, a rented ranch, a prison letter, and then someone is not who they said. The question that sorts them is not how many bodies turn up but which half of the book is steering, the danger or the romance, and the answer changes the whole reading experience.
Across the Vanishing Sky is the one for readers who want the romance in charge and the threat kept at the edge of town until the last third. Two Alone is the opposite bet, a plane down in the wilderness with the danger running every page and the romance earned only after the survival.
Some of these put a threat on the first page and let the love story catch up. Others are love stories first, with a menace that arrives late and changes everything, and a third kind refuses to say which it is, because the person the heroine is falling for is also the one she should be running from. Each entry says plainly which way the book leans, and that is usually enough to know whether it is yours.