The Highland Falcon Thief (Adventures on Trains Series, Book 1)

In The Highland Falcon Thief: Adventures on Trains #1, amiddle-grade series starter from MG Leonard and Sam Sedgman, ayoung boy is swept up in an investigation to uncover theperpetrator of a jewel theft.When eleven-year-old Harrison "Hal" Beck is forced to accompanyhis travel-writer uncle on the last journey of a royal train, heexpects a boring trip spent away from video games and children hisage.But then Hal spots a girl who should not be on board, and hequickly makes friends with the stowaway, Lenny. Things get evenmore interesting when the royal prince and princess board for thelast leg of the journey—because the princess's diamond necklace issoon stolen and replaced with a fake! Suspicion falls on the oneperson who isn't supposed to be there: Lenny.It's up to Hal, his keen observation, and his skill as a buddingsketch artist to uncover the real jewel thief, clear his friend'sname, and return the diamond necklace before The Highland Falconmakes its last stop.