Brunswick Gardens (Charlotte & Thomas Pitt #18)
Anne Perry

When Unity, three months pregnant, tumbles down the staircase to her death, superintendent Thomas Pitt is virtually certain that one of the three deeply devout men in the house committed murder. Could it have been the Reverend Parmenter, his handsome curate, or his Roman Catholic son? Pitt and his clever wife, Charlotte, refuse to settle for less than the truth--and justice. . . .