Lobbyists and a reelection campaign prove a volatile mix in Shogan-s entertaining fourth mystery featuring Congressional aide Kit Marshall (after 2017-s Calamity at the Continental Club). As the chief of staff for North Carolina representative Maeve Dixon, Kit is in charge of her boss-s last fund-raiser in Washington, D.C., held at an upscale restaurant with views of the Capitol. As the event is winding down, powerful transportation lobbyist Van Parker falls off the restaurant-s spectacular rooftop to his death. When Det. Maggie Glass of the Metro police arrives at the scene, she has a number of guests to question, including Lauren Parker, Van-s disaffected wife; Max Robinson of the Bicycle Advocacy Movement; and Dash Dugal of the American Railway Federation. With the investigation putting Maeve-s reelection in peril, Kit turns sleuth and, in classic Agatha Christie tradition, assembles all the suspects for the grand finale. Shogan, a senior executive at the Library of Congress who teaches American politics at Georgetown University, bolsters her tale with an insider-s knowledge of the ways of Washington. Agent: Dawn Dowdle, Blue Ridge Literary. (July)