Cool old school stuff. Shayne is pretty interesting character because he's supposed to be this cliched hard-boiled detective but still he makes few mistakes. Right at the start of the case he loses the girl he was tailing ("He was frozen with indecision, which was an unusual state for Shayne"), later moves a corpse before police arrives to the crime scene, walks into the Professor Quesada's house without any plan (so he gets knocked out) and other silly stuff like that. But still he manages to tie up all the loose ends very efficiently in a great ending when all the pieces fall in place.

More here (review includes spoilers!):
http://a60books.blogspot.ie/2014/03/f...