Indiana is smart, but apparently not so smart that just finding an Adventure Book is enough to learn all its secrets. Collecting the book is just the first step, but unlocking its ability requires you to go into the Books tab of the menu, highlight it, and spend your Adventure Points to unlock whatever skill it can grant you. Once you have unlocked it, that skill will be permanently active from that point forward. There are dozens of Adventure Books in Indiana Jones and the Great Circle, but
