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The Aldens climb a mountain and find a mystery! The hike up Old Flat Top was only supposed to take a day, but a dangerous rockslide changes everything to reveal a hidden cave that just may hold a legendary treasure!

When the Aldens spend the summer riding on a train, they get to live in a train car once again—this time, they're staying in Caboose No. 777. The number is hard to forget, and indeed, the children meet people at each stop who seem to know it well. It turns out Caboose No. 777 has an unusual past—one that comes with its very own mystery!

Dear diary... The good news: Bess, George, and I are on a train bound for Denali National Park, gazing at majestic Mount McKinley as we speed along. It's truly awesome! The bad news: Someone - a creepy passenger or a disgruntled employee? - is still causing major trouble on the Arctic Star cruise ship, and now that we're sightseeing on land, the danger has followed. Whoever it is has got even me in their sights - but I've been working undercover, so I have no idea how anyone discovered I'm a detective.

Frank and Joe are back on Black Bear Mountain, the scene of a previous wilderness adventure and mind-bending mystery. This time, the brothers are checking in on Dr. K, a friend they made during their first trip. Dr. K is a fan of living off the grid, but he’s been MIA long enough to cause worry in the small mountain town. And so the teenage detectives Black Bear Mountain relied on before have been called in to help once again.

It felt like only minutes had passed when I woke up with a start. I glanced over at the digital clock I had placed on the nightstand; it read 3:19 a.m. I had been fast asleep for hours — what had woken me up? I raised my head to look around the room, and my heart leaped into my throat.

Bess and I were thrilled to bump into our old buddy Maggie Rogers, a promising young dancer who is in River Heights to perform a lead role in Sleeping Beauty. But someone's out to get Maggie. First, her phone was tampered with, making her late for rehearsal. Then, her face was violently scratched out on the show's posters, and her dressing room was trashed beyond belief. I'm determined to find out who's trying to sabotage my friend's career. But I have to crack this case before the big show — or it could wind up being Maggie's last dance!

After a close call, Mr. Drew insists that if Nancy's going to be an amateur detective, she needs to be able to defend herself. So Nancy, Bess, and George decide to check out a Jiu-Jitsu class at Iron Dragon MMA. The technique is hard, but before she knows it, Nancy's having a lot of fun. And then, just as class ends, the students are shaken by a disturbing sight—someone's left a dead rat on the front desk and spray-painted "traitor" on the wall. With a big competition coming up soon, is a rival academy trying to stir up trouble to throw the Iron Dragon team off their game?

Nancy and her friends are on an epic quest to discover the identity of a treacherous Greek scholar in this fifteenth book of the Nancy Drew Diaries, a fresh approach to the classic mystery series. Nancy, Bess, and George are excited to attend Oracle College's annual Greek mythology themed gala. But the festive spirit turns troubled when a student falls from the balcony mid-speech. Nancy's investigations quickly reveal this was a case of collegiate sabotage. Can she find the campus menace before someone else gets hurt?

Nancy and her friends are out to find a comedian's saboteur in this 17th book of the Nancy Drew Diaries, a fresh approach to the classic mystery series.

Nancy and Ned are visiting Coffin Hall, an estate turned rare books library, doing research on the library's rumored ghost for an episode of the NedTalks podcast when a fire breaks out in the records room. One of the library's security guards accuses Ned of arson—after all, he was the only one in the room when the fire started—but Ned swears it wasn't him. He was trying to stop the fire. He tells Nancy he saw a lady in blue right before the incident, and thinks it was Henrietta Coffin, the ghost of Coffin Hall!

Bess and George’s cousin Veronica is getting married to extreme sports enthusiast Xavier Redd, and as a close friend of the family, Nancy has been invited to the wedding. Given the groom’s big personality and love for the extreme, the wedding will take place in Vegas, and the couple plan to take advantage of local sporting opportunities in the week leading up to the big event.

In the second book of the Peabody series, Scruggs finds himself caught in the middle of a ring of international spies, and they are trying to get rid of a stolen piece of technology. He has to decide who to trust among the strangers he meets, and he has to rely on his wits and courage as he tries to find a way back to the home he has longed for in Peabody, Wisconsin.

This bundle includes Basil of Baker Street, Basil and the Cave of Cats, Basil in Mexico, and Basil in the Wild West.

This bundle includes Basil and the Lost Colony, Basil and the Big Cheese Cook-Off, Basil and the Royal Dare, and Basil and the Library Ghost.

This bundle includes The Curse of the Ancient Emerald and Tunnel of Secrets.

This bundle includes The Clue at Black Creek Farm and A Script for Danger.

This bundle includes The Vanishing Game and Into Thin Air.

This bundle includes Mystery of the Midnight Rider and Once upon a Thriller.

This bundle includes Sabotage at Willow Woods and Secret at Mystic Lake.

This bundle includes Shadows at Predator Reef and Deception on the Set.