There are 2 books in the Fly By Night series. The newest book is Fly Trap which came out in 2018.

1
Fly By Night

Book cover of Fly By Night
Everybody knew that books were dangerous. Read the wrong book, it was said, and the words crawled around your brain on black legs and drove you mad, wicked mad. Mosca Mye was born at a time sacred to Goodman Palpitattle, He Who Keeps Flies out of Jams and Butterchurns, which…
When you buy books, we may earn a commission that helps keep our lights on (or join the rebellion as a member).

2
Fly Trap

Fly Trap
Mosca Mye and Eponymous Clent are at it again. Escaping disaster by the skin of their teeth, they find refuge in Toll, a strange gateway town where visitors may neither enter nor leave without paying a price. By day, the city is well-mannered and orderly; by night, it's host to…