Summer of My Amazing Luck is Miriam's first novel and a favourite for many die-hard Toews fans.      Welcome to Winnipeg's Have-a-Life housing project . . . better known as Half-a-Life. Meet eighteen year-old Lucy and flamboyant Lish, two of the single moms who live there. Lucy has no idea who the father of her son is. Lish has four girls, and though she says she doesn't want a man around, she still pines for the father of her twins, a fire-eating busker who was just passing