This contradictory thought process is what has infuriated me when engaging with the PGP. We know Mignini was listening in on conversations both Raffaele and Amanda were having. This is where they zeroed in on the net they cast when tapping others they thought connected or having information they could glean. They were familiar with Lumumba long before they dragged her in for that interrogation. However, they needed to put Amanda in a position to name him. The minute she did they sent a squad to go get him. They did so all on the premise the cunning liar couldn't pull one on them! Truthiness is so easy to parse out when you are ready for it!
This is not the only bait and switch Follain has in his book.
He really does have to set up the "fact" that the PLE was right to suspect AK and RS all along. It is why Follain constructs the narrative the way he does - When Battistelli says, "This is no burglary," Follain concludes that thought with Amanda and Raffaele "saying nothing". Presumably they say nothing because they know why it is no-burglary. So says Follain.
Similarly, Follain constructs his narrative so that Raffaele seems suspicious to Napoleoni for trying to point out the pooh in the toilet. He seemed TOO forceful in that. (P. 77 A Death in Italy: "(Napoleoni) was puzzled and guessed that for some reason or other, Amanda and Raffaele wanted to make sure that she would notice it."
(The non-suspicious alternative does not occur to Follain in his narrative.)
Bait.
Now switch.
At interrogation, Knox has to catch them all completely off guard by "naming Lumumba".
Before ANY questioning could result from Ficarra making the bare assertion that the "Sure, See you later, Have a good evening!" (cf. p 134), Amanda is banging herself on the forehead and accusing Patrick. No intervention (mediation from Donnino, no slap on the head, no accusation of liar, no demand to imagine).
Completely. Off. Guard. Ficarra, acc. to Follain, abruptly ends the interrogation and informs Napoleoni.
No clue whatsoever that Amanda is involved, until she abruptly and with no goading or warning, names Lumumba.
Follain cannot have both. It is telling that nearly all guilter narratives, such as they are, include this kind of, "having your cake and eating it too."