David Baldacci has served up just what the doctor ordered for sheltering in place during a pandemic with “Walk the Wire” (Grand Central, 432 pages, $26.98), featuring the stalwart and cerebral FBI agent Amos Decker.Decker and his photographic memory are put to their greatest test ever when he and his partner Alex Jamison are summoned to the oil-rich grounds of North Dakota, where boom towns have sprung up virtually overnight, bringing [...]