Seventh-grader Steve Brixton finds himself pulled back into sleuthing when, during a train trip down the California coast, he uncovers a mystery involving a fleet of priceless automobiles, an assassin, and a private rail car.

Going undercover on the Kratzenstein family's funeral train to find out if these German railway tycoons are possibly cursed, twelve-year-old Hal Beck and his Uncle Nat find themselves faced with a paranormal puzzle--and murder.

The Impossible Postal Express is no ordinary train. It's a troll-operated delivery service that runs everywhere from ocean-bottom shipwrecks, to Trollville, to space. But when this impossible train comes roaring through Suzy's living room, her world turns upside down. After sneaking on board, Suzy suddenly finds herself Deputy Post Master aboard the train, and faced with her first delivery-to the evil Lady Crepuscula. Then, the package itself begs...

Henry, Jessie, Violet, and Benny are on a train from Boston to San Francisco. Even though they used to live in a boxcar, this is the first time they've ridden a real, moving train. And they find a mystery to solve even before they leave the station. Is someone trying to steal a young woman's portfolio? Could it be the porter? Or is it the tall, bearded man who always wears sunglasses -- even at night? What's in the portfolio, anyway? Can the Boxcar...

Following his adventure on the California Comet, artist and amateur sleuth Hal Beck is looking forward to another railway journey with Nat, his journalist uncle―this time riding the historic Safari Star through South Africa. Then the already eventful journey becomes even more so when one of their fellow passengers dies on board! Accident . . . or murder? With help from a new friend, Winston (and his mongoose, Chipo), Hal is determined to figure...

Kate's humdrum life is transformed when her eccentric Uncle Herbert brings her a colossal locomotive train, the Silver Arrow, as her eleventh birthday gift, leading her and her younger brother on a mysterious quest.

When the Impossible Postal Express is charged with returning an overdue library book, Suzy Smith looks forward to a nice, simple delivery--just the thing she needs to convince her anxious parents to let her keep her job on the train. So shes less than thrilled to discover that not only is the book alive, it's full of a growing and dangerous magic. Worse still, the world to which it belongs is missing, and Suzy and her friends will have to use all...

Suzy Smith and her friends have gathered again for the re-launch of The Impossible Postal Express. The celebrations don't last long though, before Trollville is rocked by a violent tremor-one of a series growing more powerful by the day. It's clear something sinister is underfoot. Nevertheless Suzy's got a long overdue package that the Express must deliver, and it may just lead her to some answers. --from Amazon.

Following clues provided by the secretive Reddimus Society, the four Alden siblings travel to a dingo sanctuary in Australia and to Shakleton's hut in Antarctica to deliver the fifth and sixth artifacts, and then they work to unmask the traitor traveling with them.