Keller’s work takes him to New York, the former home he hasn’t dared revisit, where his target is the abbot of a midtown monastery. Another call puts him on a West Indies cruise, with several interesting fellow passengers — the government witness, the incandescent young woman keeping the witness company, and, sharing Keller’s cabin, his wife, Julia. But the high drama comes in Cheyenne, where a recent widow is looking to sell her husband’s stamp collection