'As implied by the title … the problems posed often arose in the context of a tradition that is well established in many university departments of mathematics, whereby the members of the department gather for afternoon coffee or tea and do what they like to do best: discuss mathematics. Such camaraderie among mathematicians can be felt by readers working through the problem solutions, most of which also include a fascinating account of the history of the particular problem and the mathematicians who were involved in discussing it … Highly recommended.' D. S. Larson, Choice