Hawaii Five-0 (2010)

S4E11 Pukana (Keepsake)

A chilling case emerges as Chin delves into a suspected serial killer investigation, putting his life at significant risk. Meanwhile, Grace and Danny stumble upon an intriguing puzzle box shrouded in mystery. As they grapple with the enigma, the tension escalates, intertwining their discoveries with the darker threads of Chin's perilous situation.