Darkus Cuttle has taken care of his father ever since his mother died, but one day his father vanished from a locked vault at the Natural History Museum, and now he lives with his eccentric uncle--but one day he finds a large and unusually intelligent and self-aware beetle, and soon he and his two friends are caught up in a struggle to protect an intelligent super species of beetles.

Harrison Beck is reluctantly joining his travel-writer Uncle Nat for the last journey of the royal train, The Highland Falcon. But as the train makes its way to Scotland, a priceless brooch goes missing, and things suddenly get a lot more interesting. As suspicions and accusations run high among the passengers, Harrison begins to investigate and uncovers a few surprises along the way. Can he solve the mystery of the jewel thief and catch the culprit...

"Cruel beetle fashionista, Lucretia Cutter, is at large with her deadly yellow ladybug spies -- and she has a devious plan. When Darkus, Virginia, and Bertolt discover further evidence of her evil, they're determined to stop her"--Jacket flap.