The 22 Murders of Madison May by Max Barry

 

Barry is a pretty decent writer, working in the interstices between more conventional thrillers (a la Ludlum, though this doesn't have much specifically Ludlumesque in it) and various iterations of Fantasy/SF. This is kinda a crime thriller crossed with Multiverse stuff, doesn't seem to take itself all that seriously: Barry isn't a particularly funny writer, but there's plenty of wit and sparkle in his prose, here. Has some interesting things to say about identity and the subtle ways we change the world around us, and how every person might be important even if there are approximately infinite variations of them. Gets a little sloggy through the middle, but otherwise good and worth reading.