Walker wraps up the 12th and final installment of her Black Knights Inc. romantic suspense series (after Hot Pursuit) with a thrill ride of a plot and an impressive array of irresistible alpha males. Stoic Angel Agassi was forced to leave his old name, his old face, and his one true love to save the world (or at least keep Iranians from building a nuclear program). Smart, softhearted Interpol agent Sonya Butler has spent 10 years mourning Mark Risa, the tough-as-nails Mossad agent she believes died on the banks of the Seine. When she's planted in the home of an almost cartoonishly ruthless crime boss who's determined to build a nuclear bomb and take out part of Chicago, she comes face-to-face with Angel, a seemingly bad guy who inexplicably reminds her of Mark. But as everything goes topsy-turvy, questions arise: who is Angel, really, and is Sonya a turncoat or undercover? Walker delivers a hair-raising crisis at every turn, punctuated by steamy interludes and glimpses of the happily-ever-afters of all the previous protagonists. She ends her series on a high note, leaving her fans eager for whatever she embarks on next. Agent: Nicole Resciniti, Seymour Agency. (July)