Opinions on this episode vary widely LOL. But that's the result when different people have different tastes and different abilities to follow a story of this pace. This one isn't for the action junkie, despite the second recent boat chase down the Kapalama Canal.
The story is spy versus spy with at least two interesting twists and another case where another interested investigator has objectives of his own, and they don't match McGarrett's.
While I disagree with some other fans about the writing and entertainment value of the episode, I will agree that they utterly wasted the casting of Juliet Mills. And both British actors seemed curiously elderly for the roles. Matheson was 63 and O'Herlihy 56, but both men looked 80 and not a day younger. LOL
But McGarrett's scenes with Dan O'Herlihy were impressive, with the attitude Jack Lord frequently brought to his role.