第一位死者被人用箭射穿心脏，第二位死者被枪射穿头部，第三位死者从高墙上摔死......署名"主教"的残酷凶手不断地刻意提供线索，一连串令人不寒而栗的离奇命案，竟然与一首家喻户晓的古老童谣完全吻合！——是谁杀了小知更鸟？"是我。"麻雀回答。"我用弓和箭射死了小知更鸟！"阴暗、幽沉的童谣宛如恶魔谱下的追魂曲一般，预示着一幕幕血腥的惨剧，死亡的阴影霎时笼罩了整个纽约......谁是藏在幕后的黑色主教？他为什么制造谋杀又提供线索，如幽灵般若隐若现？一切究竟隐藏着什么天大的阴谋？(The first dead was shoot through the heart with arrow by someone; the second dead was shot through the head by gun; the third dead felt to death from the high wall... the cruel killer with signature of "bishop" constantly and deliberately provides the clues. A series of creepy and odd homicide cases are completely identical with an old well-known nursery rhyme! ‐Who killed the little robin? "I", said the sparrow. "I killed the little robin with bow and arrow!" Just like the song of soul chasing composed by the devil, the dark and gloomy nursery rhyme indicates the scenes of bloody tragedies and the shadow of death instantly covers the whole New York... Who is the black bishop hidden behind? Why does he create the murders while provide the clues and appear indistinctly like the ghost? What extremely big conspiracy is hidden behind all things?)