Three books in & these are proving to be reliably fun & clever middle-grade/YA mysteries. I enjoy being in Hazel's head & this is an homage to Christie's Murder on the Orient Express that hits all of the right notes. I just found the cast of characters excessively annoying in this version; it really shouldn't matter, but it got to the point where I was hoping that all of them would perish in some unfortunate way (except for the Junior Pinkerton).