This is such a delightful series and Myrtle has utterly charmed me again. I love all the quirky people she encounters and how much those that love her let her be herself (within reason because she is a child and they need to at least try to keep her safe). A locked room train mystery is my FAVORITE and this one was wonderful. So many twists and turns and the author lulls you into thinking you know what is going on, then easily slips you some misdirection and by the end you head is spinning with all the unlikely pieces of the truth. I am already excited to reading more from Myrtle's adventures.