Astonishingly, Steine has no idea that the man is the great “Ppoliceman’s friend”," Harry Jupiter; i. In reality, Steine has never even heard of him. Astonishingly, Steine has no idea that the man is the great “policeman’s friend," Harry Jupiter. In reality, Steine has never even heard of him.

Astonishingly, Steine has no idea that the man is the great “Ppoliceman’s friend” Harry Jupiter; in realityfact, Steine has never even heard of him. Astonishingly, Steine has no idea that the man is the great “policeman’s friend” Harry Jupiter; in fact, Steine has never even heard of him.

To me, “in fact” sounds more natural here.

If Steine had known that the man was a journalist, he would have had him “led”"led" him out of the police station at once. If Steine had known that the man was a journalist, he would have "led" him out of the police station at once.

*The* needs to go before any specific nouns (man). The second sounds more natural.

If Steine had known thate man was a journalist, he would have had him “led” out of the police station at once. If Steine had known the man was a journalist, he would have had him “led” out of the police station at once.

He is irked by their asking questions of he has no answers to. He is irked by their asking questions of he has no answers to.

He also blames their steadily and massive output of news as the reason landmark events are on the wane. He also blames their steady and massive output of news as the reason landmark events are on the wane.

He also blames their steadily and massive output of news as the reason landmark events are on the wane. He also blames their steady and massive output of news as the reason landmark events are on the wane.

He also blames their steadily and massive output of news as the reason landmark events are on the wane. He also blames their steady and massive output of news as the reason landmark events are on the wane.

To top it all*, its waning has given way to the old, wicked image of Brighton portrayed in the film “Brighton Rock.” The whole thing has fuelled even more Steine’'s anger towards journalists and ignorant tourists even more. To top it all*, its waning has given way to the old, wicked image of Brighton portrayed in the film “Brighton Rock.” The whole thing has fuelled Steine's anger towards journalists and ignorant tourists even more.

To top it all* off, its waning has given way to the old, wicked image of Brighton portrayed in the film “Brighton Rock.” The whole thing has fuelled even more of Steine’s anger towards journalists and ignorant tourists. To top it all off, its waning has given way to the old, wicked image of Brighton portrayed in the film “Brighton Rock.” The whole thing has fueled even more of Steine’s anger towards journalists and ignorant tourists.

In American-English at least, we use the phrase "to top it all off" more commonly.

To top it all* off, its waning has given way to the old, wicked image of Brighton portrayed in the film “Brighton Rock.” The whole thing has fuelled even more Steine’s anger towards journalists and ignorant tourists. even more. To top it all* off, its waning has given way to the old, wicked image of Brighton portrayed in the film “Brighton Rock.” The whole thing has fuelled Steine’s anger towards journalists and ignorant tourists even more.

The idiom is “top it all off,” so I added “off.”

Thus, it is not unusual to have Inspector Steine intercepting groups of tourists and directing them to his go-to spot, namely Middle Street. Thus, it is not unusual to have Inspector Steine intercepting groups of tourists and directing them to his go-to spot, namely Middle Street.

Steine thinks that if they have come over to Brighton to sightsee the “historical crime sites”—which the film got all wrong—surely they will be keen to go to the place where 45 villains killed themselves in a massive shootout. Steine thinks that if they have come over to Brighton to sightsee the “historical crime sites”—which the film got all wrong—surely they will be keen to go to the place where 45 villains killed themselves in a massive shootout.

Which, as a result, wiped out at, in one stroke, every nefarious activity in town. Which, as a result, wiped out, in one stroke, every nefarious activity in town.

WThichs event, as a result, wiped out at one stroke every nefarious activity in town in one stroke . This event, as a result, wiped out every nefarious activity in town in one stroke .

The sentence needs a subject to be grammatically correct, which is why I added "this event."

*Are the expressions “to top it all” and “on top of (that)” really informal? *Are the expressions “to top it all” and “on top of (that)” really informal?

I find "to top it all of" a bit more formal than "on top of that." I don't think either are that informal actually, but I do think they add a lot more flavor and character expression. "To top it all off" gives the impression that Steine is really quite exasperated with these events in a "straw that broke the camel's back" kind of way.

If so, are there any synonyms with that same “emphasis”? If so, are there any synonyms with that same emphasis?

I actually can't think of any off the top of my head. I would say just go with "to top it all of" over "on top of that."