I have long been a fan of the original "Hawaii Five-O" and am the proud owner of all 12 seasons. And, after having reviewed every episode up to the middle of season 11, I have noticed something. When Danny gets a girlfriend, something BAD is about to happen!! She'll either become the target of killers, is a killer herself or is in some other trouble with the law. So, when Danny recognizes an old girlfriend down at the police station, it's not at all surprising that she's there because she just committed a crime! And, it's not surprising that she turns out to be the ex-girlfriend of a one-man crime spree! Unfortunately for Danny, he's slow on the uptake and she lies to him and uses him repeatedly. So, it's up to good old Steve to set Danny straight and work with him to get the old boyfriend and figure out what the lady's angle is in all of this.
This is a pretty interesting episode--even if Danny does seem, at times, like he's dumber than a goat. Plus, while the girlfriend angle isn't new, her motivation and the real story is. Worth seeing and better than the average season 11 episode (which, unfortunately, isn't saying all that much).
By the way, if you do see this one, note Moe Keale as the sleazy guy working in the pizza joint. In season 12 he'd begin playing a regular member of Five-O! This sort of thing wasn't without precedent, as earlier in the series, Al Harrington played scum-bags and later played a regular member of Five-O.