Spoiler:
<p class="calibre26">Masters nodded. ‘You may step down, Ms Carelli.’</p>
<p class="calibre26">Mary stood stiffly, seemingly unsure that it was over. She was still for a moment, as if preparing for the reporters outside, the cameras, the people who wished to cheer her, to revile her, or simply to collect her autograph. Then she walked across the courtroom, composed again, as she had been that day fifteen years before, leaving the Senate.</p>
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Remove the <div class="mbppagebreak" id="calibre_pb_43"></div> from your ebooks.
Their seems to be a bug in the adoble sdk that does not like blank/empty display blocks at the end of an xhtml file.
I have seen a <p></p> at the end of a file cause this problem in various reader apps based on the adoble sdk.
bernie