My Sister, the Serial Killer

Kinda like 27 Dresses, but with murder: always a murder cleaner-upper, never a murderer, and usually begrudgingly. It's a well-written story, and I loved the voices the audiobook reader does. But these characters all behave predictably and barely have character arcs, only reaching small ones at the end, that, arguably, were kind of already present. Instead of spoiling and saying outright why I feel that way, all I can say is that their arcs resemble, in a murdery sort of way, that of their 27 Dresses counterparts.