“A Distant Grave,” by Sarah Stewart Taylor (Minotaur)Homicide detective Maggie D’arcy has been hoping to heat up a cross-Atlantic romance with her sweetheart, Conor Kearney, but after a body turns up on Long Island beach, her trip to Ireland appears to be off.When the murder victim turns out to be Gabriel Treacy, a Dublin resident who had just arrived in America, however, she flies to the Emerald Isle to combine business with pleasure.