In The Orphanmaster (Viking, $27.95), Jean Zimmerman turns her knowledge of seventeenth-century Manhattan into a tale of mystery, romance, political intrigue, and suspense. Orphan children are disappearing or turning up dead, and among those investigating the mysterious state of affairs are a quick-witted, twenty-two-year-old trader and a dashing British spy. Both the search for the killer and their newfound romance are endangered when one is accused of being a witch and the other is sentenced to hang for espionage. Zimmerman is the author of numerous works of nonfiction, including Love, Fiercely: A Gilded Age Romance, and The Women of the House: How a Colonial She-Merchant Built a Mansion, a Fortune, and a Dynasty. This is her first novel.