For an LOL (little old lady), Ivy Malone gets into a heap of trouble! 'Invisible' is light reading, but compelling - I had to know who was at the bottom of this crime. Ivy's Christianity colors everything about her life, and her curiosity pushes the story along. Believable? Maybe not...how many crimes a have been solved by a little retired librarian? Readable? Yes - I hope to read more Ivy Malone mysteries. I read the Kindle edition.