Early in bestseller Johansen and son’s suspenseful fourth novel featuring Dr. Kendra Michaels (after 2015’s The Naked Eye), Kendra, who was blind until she was 20, delivers a research paper on aging at Pepperdine University in Malibu, Calif. Afterward, she’s surprised to discover that Dr. Charles Waldridge, the British surgeon who restored her sight nine years earlier, was in the audience. The two have dinner at a nearby ocean-side restaurant, where Charles says he’s come to L.A. from London on a fund-raising mission. Kendra cleverly deduces that something else is causing Charles stress, but he won’t tell her what. When he later goes missing, Kendra believes foul play is involved and enlists the aid of former FBI agent Adam Lynch in her search for Charles. The danger that Kendra and Adam face increases dramatically as they get closer to the truth, as does the attraction between the two. The plot builds to a stunning conclusion. Agent: Andrea Cirillo, Jane Rotrosen Agency. (Oct.)