This is a tiny (something like A6, 120 pages) book on knot theory. It introduces knot theory in a number of fairly self-contained chapters, working through 2-D projections, braids and a number of invariants. It's at the hard end of pop maths, in that it's not at all afraid to throw equations and even proper mathematical terminology around, but regularly stops short of proving things, citing space limitations. The approach, if anything, is reminiscent of Garrity's book. A most enjoyable book, it's piqued my interest in knot theory, which I'd love to come back to when my book backlog has declined somewhat.