Eventually, the two children meet up and try to locate the five members of the defunct and not-talked-about Filipendulous Society, since the most famous member of the group was Evie's gradnfather. This course of action is fraught with peril, and the children find themselves rappelling from clock towers, meeting up with boa constrictors, and being madly pursued by a man whose mouth is wired shut. Will Evie be able to locate her grandfather, and will Sebastian be able to come to grips with a wildly unorganized life? This ends in a cliffhanger, so perhaps we will find out in book two.
Perfect for more advanced, younger readers who enjoyed Beha's The Secrets of Eastcliff-by-the-Sea, Milford's The Greenglass House, or Primavera's Ms. Rapscott's Girls, The Door in the Alley is a quirky, action packed mystery filled with puzzles, snarky footnotes, and pigs in hats.
This is very different from Kress' Young Adult titles such as The Friday Society or Hatter Mattigan. I'm not entirely sure that middle school students will go for it, but elementary students should love it.