xreactivity

a measure of relatedness between two antigenic substances

The Weed That Strings the Hangman's Bag

The Weed That Strings the Hangman's Bag - Alan Bradley

 

Second book featuring child-detective Flavia de Luce. I suspect I'm one of the few who doesn't find this character endearing. She's annoying, amoral, and far too precocious for belief. I did enjoy this story more than the first, though.