Warren's heart-pounding fourth installment of the Montana Rescue series (after A Matter of Trust) sees the PEAK Rescue team in action outside their comfort zone. Billionaire Ian Shaw, a benefactor to the PEAK team, has fallen on hard times financially and emotionally, with his fortune temporarily frozen by the government after one of his oil rigs starts a massive fire and his long-lost niece, Esme, still missing after running away years before. He doesn't know that Sierra, his favorite PEAK Rescue assistant, has found Esme but is promise-bound to keep her whereabouts a secret. The long-simmering tension between Ian and Sierra, each of whom desperately loves the other, continues to separate them even during a fundraising junket to the Caribbean on Ian's yacht. When a rogue wave hits the yacht, Ian and Sierra are forced to face their greatest fears and deepest desires. Fans of the series will be delighted to see not only the culmination of this couple's story but also more romantic progress for PEAK Rescue teammates Jess and Pete. Though background information about the characters from previous books is helpful in appreciating the new romantic developments, this book also stands on its own, combining faith, action, romantic tension, humor, and emotional depth into an adventurous love story. (Jan.)