Mr Penumbra's 24-hour Book Club by Robin Sloan

This book is not what I expected but it is quite good fun. It is about Clay, a young unemployed web designer in San Francisco who takes on a night shift in a small old fashioned book store owned by Mr Penumbra.  Clay's curiosity as to the mysterious coded books which are loaned to eccentric members of a book club leads him on a quest to discover the secret of eternal life. The plot is a little too ridiculous for me, and doesn't even really make sense as a lot of it is never properly explained. However, it is an an enjoyable bit of silliness which is good for a sun lounger