"He was twenty-nine!" Argyll shouted at him. He came further into the room and the light shone on his face. Monk could not help seeing the resemblance to his brother: the line of his mouth, the color of his well-shaped eyes, the way his hair grew. "How do you fall off a bridge?" he demanded. "Was there a crime, and you're not telling me? Was he attacked?" Rage flared in his voice and his fists clenched.

"He wasn't alone," Monk said quickly, before Argyll should lose control. Grief he was used to, even anger, but there was a thread of violence just under the surface in this man that was fast unraveling. "A young woman named Mary Havilland was with him…"

Argyll's eyes flew wide open. "Mary? Where is she? Is she all right? What happened? What are you not telling me, man? Don't just stand there like an idiot! This is my family you're talking about." Again the fists were tight, skin on his knuckles stretched pale across the bone.

"I'm sorry, Miss Havilland went over with him," Monk said grimly. "They went over holding on to each other."

"What are you saying?" Argyll demanded.

"That they both went over, sir," Monk repeated. "They were standing together by the railing, having what appeared to be a heated discussion. We were too far away to hear. The next time we looked they were at the railing, and the moment after, they overbalanced and fell."

"You saw a man and woman struggling and you looked away?" Argyll said incredulously, his voice high-pitched. "What at, for God's sake? What else could possibly be-"

"We were on patrol," Monk cut across him. "We watch the whole river. We wouldn't even have seen that much had they not been so close to the rail. It appeared an ordinary conversation, perhaps a lovers' quarrel then made up again. If we'd have continued watching, it could have been intrusive."