Ian Duff: 2 books

Opening boxes, running down an up escalator, swimming lengths, using a map print side down, a circular billiard table, cropping paper, the geometry of perspective, calculus-free optimisation – you’ll find this and much more in these 274 problems. To tackle them all you’ll need a clear logical...

When Ians wife, Jade, is kidnapped during a drive-by shooting as they celebrate their first anniversary, his world changes forever. Twenty years later, there are still questions about her disappearance, and even his career as an independent assassin for the FBI has not brought him closer to solving...