I am currently reading Borrower of the Night, which is the first book in the Vicky Bliss series of mysteries by Elizabeth Peters. I actually listened to the second book in the series, The Street of the Five Moons, when I went away at Easter because there weren't really many other audiobooks available at the library that I wanted to listen to.
As I am reading Borrower, I have actually been pretty distracted, because I don't remember any mention of one of the main characters from this book in Five Moons. So how could Tony just disappear without a mention in the second book? I even asked someone I know who read the second book more recently than I did, but they don't remember any mention either. I asked her if I just didn't remember because the name had no significance to me when I read it! Maybe all will be explained eventually, but in the meantime it is definitely distracting.
Of course, I could have just listened to those Vicky Bliss fans who suggested that it would be no big deal if I didn't read this one in the first place!