Ruby finds herself in another mysterious mess, and this time, the culprit may just be supernatural! On a routine trip to the O'Deary Library with her sister Hailey, Ruby overhears a conversation between the owner, Ava O'Deary, and the librarian, Ophelia Bedelia. Ophelia is terrified because of strange, late night activities in the library, and she suspects the worst: the library is haunted! Ruby springs into action, and it isn't long before she finds herself in a spooky whirlwind of paranormal activity.

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Ruby is in way over her head. With indisputable paranormal evidence piling up around her, she edges closer and closer to the truth: is the O'Deary Library really haunted after all? And what exactly happened at the séance? Books can't slip off shelves and propel themselves through the air of their own accord... can they?! If that weren't scary enough, it seems like Ruby's nemesis, Diana, is haunting the halls of O'Deary Library, too. Diana has discovered that Ruby's sister, Hailey, is participating in a fundraising challenge for Because I Am a Girl (campaign). The winner gets tickets to see The Mint Chip Girls in concert. Diana is determined to win those tickets. And Ruby is just as determined to prevent her from getting them. And there's one more mystery for Ruby to investigate: who is that hot, young man and where does he keep disappearing to?

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Things are getting out of control, and fast. Library owner, Ava O'Deary is dead but there's no Will to determine the fate of her fortune and the O'Deary Library. That means Ava's nearest relative, Lillian O'Shyte, will inherit everything. Lillian plans to burn the books and turn the library into an adults-only condo building. Ruby can't let that happen, but what can she do to stop it? Ruby has one idea: solve Ava's Last Puzzle! That's how Ruby discovers a video message from the late Ava O'Deary. Ava has left a trail of clues that lead to her will. The heir who finds the Will inherits everything. Ruby joins the hunt for the will, all the while trying to get to the bottom of where these mysterious family members' loyalties really lie.

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Ruby has discovered Ava's first clue inside Alice's Adventures in Wonderland. Now, she suddenly finds herself being pursued on all sides by Ava's questionable relatives! With Henry and Lillian both competing to win Ruby's help in solving the case, the young detective will have to do what she does best: solve the case herself! Ruby decides to hide in the library until after closing so she can search the place thoroughly with no one else around. No one except her poor unsuspecting sister who gets trapped in the library too. After dark, O'Deary Library is even spookier than usual. Ruby is uncovers new clues but there is also some ghostly activity that defies explanation. Can the Skye sisters make it through the night, alone in the haunted library?

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More clues and even more mystery: the secret to Ava's Will is still out there, and Ruby is hot on the trail. After a long, scary night searching for more clues in O'Deary library, Ruby and Hailey have learned at least one thing: the library is definitely haunted! Pursued by shadowy figures, floating books, and creepy noises, the two sisters are seriously freaked out! Luckily, their spooky night wasn't a waste: more clues have led them to Ava's email address and to their surprise, the ghost of Ava answers their email, bringing them several steps closer to the Will. Ruby is hot on the trail of the Will. But she'll find herself making a hard choices– and seeking help from an unexpected source.

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Hailey is furious at Ruby – with good reason. Which means Ruby's on the hunt for a new sidekick in her hunt for Ava O'Deary's missing will. The mysterious, handsome Edmund seems to be volunteering for the mission. Could life get any better? Together, Ruby and Edmund decipher a few of Ava's puzzle-clues and discover the locations of a few more. Then Ruby remembers Hailey's Pink Lemonaid Stand in support of Because I Am A Girl and races off to help. But it's too late! Ruby discovers that keeping her sister up all night may have cost Hailey the contest! To the heinous Diana, no less. But Ruby has a plan to redeem herself in her sister's eyes... Or does she just want to defeat Diana? Either way, it means raising money by joining forces with one of Ava O'Deary's odd relatives in the hunt for the Will.

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Ruby's kit is missing and all the money for Hailey's Because I Am A Girl campaign along with it. Ruby knows just who took it: Diana! Ruby is determined to get the money back. Dragging Hailey along with her, Ruby trails Diana to neighbourhood ice cream parlour, The Big Chill. With Diana inside ordering, Ruby sees her opportunity to search Diana's bag to find the missing money. Only Hailey refuses to stand guard and Ruby gets a call from her old friend: Griffin! And then everything just goes from bad to worse to horrible.

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With the ghost's identity revealed, Hailey in trouble and Henry and Lillian joining forces against her, Ruby Skye finds herself very alone in her hunt for Ava's Will and her quest to save the library. Having collected nearly all of the clues, Ruby sneaks back into the library to get her hands on the last few pieces of the puzzle. But while eluding the capture of the terrible twosome, Ruby finds herself in another, even stickier situation and there's a new twist. Now, with almost all of the mysteries revealed, Ruby will have to race against time to get to the Will and make sure it ends up in the hands of the only deserving heir.

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A final struggle puts the Will in the hands of an O'Deary descendant who loves the library as much as Ava did. And speaking of Ava, she finds a way to speak from beyond the grave and reveal the intention behind her quest for the Will. Now the only a couple of questions remain. Who raised the most money for Because I Am A Girl to win the tickets to The Mint Chip Girls concert? And how will the heir to the O'Deary fortune thank Ruby?

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