Margo strolled onto the deck, her expression a mix of serenity and smugness. Serene because she loved this old lake house. Smug because she had just pulled off the impossible. The cottage had belonged to her grandparents, and it was the epicenter of her childhood summers. She, her sister, Alex, and their cousins swam all day, caught lightning bugs at twilight, and sat around the fire pit giggling and eating s'mores late i...