‘Grave Danger: A Jack Swyteck Novel’ by James Grippando. Harper, 329 pages, $30 James Grippando’s propensity for latching on to current events and weaving these issues into brisk, in-depth thrillers are a mainstay of his novels about Miami attorney Jack Swyteck. “Grave Danger,” Grippando’s 19th novel about Jack, is full of believable twists with attention to details, as he mixes a personal story with an international focus that works well. Jack’s 9-year marriage to FBI agent Andie Henning is going through a rough patch, brought on mainly because of friction that arises from their individual careers.