[bluecalm]

I think this is brilliant book. The whole series surpasses Adventures in Cardplay. The deals are beautiful, educational and actually possible to solve (admittedly though they are very very hard). Solving even one hand in a few is very satisfying but even visualizing the solution after reading it is worthwhile.
This is exceptional book from exceptional author. Martens is one of the greatest the game ever had (and even today he is elite player representing Poland in BB 2011, and taking Vanderbilt in 2008 among other achievements) and the only one from the group who is writing books (and books about cardplay!)
They are truly something completely different. I recommend Owl, Fox & Spider because I am reading it now but after browsing the whole series I am just amazed by every one of them.

Those books are not for beginners, not for intermediate players, probably not for advanced and will be hard for most experts. They are also not for a faint heart