In The Book of Madness and Cures, Regina O’Melveny takes us on a wide-ranging circuit of emotion and redemption, and we get a tour of the known world into the bargain. Set in 1590, this splendid debut novel follows the travels of young Gabriella Mondini from her native Venice all the way to Scotland, and thence to Morocco, all in search of her absented father, who is a doctor. This will reward the fortunate reader, who will learn how medieval physicians viewed illness and fevers, but more importantly,...