I might be a little mixed up on what you're never to do with this guy or that guy, but I'm sure you can figure it out.
Quick synopsis: three Victorian-era sisters each embark on an adventure to prove that their late father didn't embezzle and that he was murdered.
This trilogy is a lot of fun to read. When it came time to read the third book, I very happily sat on the couch with two sick kids while they watched kids' shows ad nauseum. I didn't even feel that guilty about missing work.
Bottom line: read them. They'll be worth the price of your favorite book medium, whether that's eBook form, real book form, or borrowed.