Tani and Junior go under cover as prospective parents to infiltrate a private school where the headmaster was murdered; Adam's life is on the line when he is held captive and forced to produce a massive amount of money.
McGarrett and Danny investigate the murder of a private detective whose client was killed the same way; Adam sends Jessie into a dangerous situation with disastrous consequences; Danny's uncle comes to town to help with the restaurant.
Grover must prevent a man who is accused of killing his wife from committing suicide.
Neela finds out the aorta surgery on Sheryl Hawkins (Aida Turturro) has caused an infection; Abby discovers a serious condition while treating a beaten teen; Kovac struggles to forgive Abby for her indiscretion.