Andrew Ridker. Photo: George Baier IV Andrew Ridker’s debut novel, The Altruists, opens with a house on fire. It’s a scene full of energy, urgency, and dark comedy. The rest of the novel uncovers the tensions hidden in this opening, telling the story of the Alter family after the death of Francine, the matriarch. Francine leaves behind her husband, cynical and narcissistic Arthur; her daughter Maggie, who wants desperately to do good in the world; and her son, the reclusive and anxious Ethan. Early in the book, we learn that Francine cut Arthur out of her will. Strapped for