Publisher's description - Jump to Page in Book 1.0.1
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If you want to jump to a specific page which might be in a different file (which might not even be open) you can use the Jump to Page in Book Adobe InDesign script.
Jump to Page in Book script is similar to the “Command/Control J” shortcut, but it works on Book files.
Installation: Open the "Scripts" panel in InDesign, select the "User" folder, select "Reveal in Finder" from the drop-down menu on the top right side. Copy the Jump to Page in Book script to the "Scripts Panel" folder in the opened window.