In Waikiki, four masked assailants in white coats robs an armored car shooting all three guards, killing two of them, in broad daylight. Five-0 quickly recover the van, as well as the money, leaving them confused but realizes the gang is likely to strike a bigger target during a triathlon event, which is being held for the next day. Furthermore, the robbers are athletes taking part in the event and are living next door to Danny's ex-wife Rachel (Claire van der Boom). Following a stakeout, Danny finds out they are to rob a diamond store. As they split up in the escape, Five-0 follow suit and each member takes down a robber.