Or maybe only one of us was holding on for dear life. It was hard to believe I'd once been the one to strike out bravely for college, leaving Hallie crying in front of the Baptist Grocery. Now it seemed like I was the baby of the family, the one with no firm plans who's allowed to fiddle around forever keeping everyone young.

Hallie was headed for a war zone. She walked straight through the puddles, dragging me along, and I had to stretch out my legs and drench my shoes to keep up with her. When Hallie was intensely excited she had a wild-animal look to her that could stop people in their tracks. A vibration came from her skin, like a bell that has just been struck. Her hair was long and reckless, curling wildly in the humidity. Every part of my sister could stir rebellion. I was thinking that if anything happened to her I wouldn't survive. I couldn't see that there would be any method, or any point.

As long as I held Hallie's arm she would still be here, she wouldn't be climbing into the truck, turning the key, driving south through Arizona and Mexico and the perilous places farther on, wouldn't be stopped at a roadblock by men who might blandly shoot her in the head for being twenty-nine years old and alone and female, wearing blue jeans, carrying antihistamine pills in her glove compartment. It seemed like a chain of events I could hold back, there in the parking lot, with the bones of her elbow securely gripped in my hand.

Her little beat-up pickup looked impossibly loaded, like the tiny burros you see in postcards carrying elephant-sized burdens without complaint. I wasn't worried about the truck. I asked where she'd put her antihistamines. We knew of a photographer who'd been shot, ostensibly for running drugs, because he had a baby-food jar of aspirin and vitamin tablets in his camera bag.

Hallie said her pills were no place easy to find.

I put my head on her shoulder. "What if our houseplants die?"

"They won't," she said. Hallie knew I wanted easy answers.

I lifted my head again and she stared at me, thoughtfully. The sky had cleared. The early-morning light behind her head was orange, making her hair glow, and she looked like an angel. She never had any idea how she looked to other people; she thought she was plain.

"If the flea beetles start getting at the ones on the porch," she said slowly, "dust them with Celite." Hallie worked for the Extension Service and answered the Garden Hotline, 626-BUGS. For a period of years ending on that day, garden pests were her life.

I hugged her with all the strength in my arms. "Hallie," I said, "could you please just change your mind now and not go?"

"You really love me, so you want me to stay here and keep the suburbs safe for geraniums."

"I know how I ought to feel," I said. "I just don't."

Her breath expanded her chest against my arms, and I thought of the way a tree will keep on growing after a fence is wired around its trunk. The unbelievable force of that expansion. And I let her go.

She started up her truck and waved from the corner, not a mournful gone-forever wave but a chin-up wave like you see in the World War II movies, where everybody is brave because they all believe in the same thing. I told myself because I had no other choice that Hallie would do all right. That we were both going to live.

I walked the six blocks home under dripping trees and a sun that was already too hot. Across the street I heard a woman say to her companion in an odd accent, "It's the Desert Museum. I had understood him to say the 'dessert museum,' and obviously I was expecting something quite different." I thought: this is how life is, ridiculous beyond comprehension. What I felt wasn't pain but a hollowness, like a drum with the skin stretched tight. It took me five minutes to get our front door open, because everything in Tucson with moving parts gets cantankerous in the rainy season. Hallie had meant to put graphite in the lock before she left.

A white balloon left over from her going-away party followed me from the living room into the kitchen. It was the size of a head, and had lost some helium so it hung at eye level, trailing its string along the floor like a tired old ghost. Static electricity drew it along behind me. I swatted it away from my head while I plundered the refrigerator. I found some red bell peppers that had been absurdly expensive at the health-food market, and washed one and ate it standing up in the kitchen. After that I found a paring knife and went to work on a cucumber. I didn't feel like cooking breakfast just for myself. Carlo was at the hospital and I had no idea when he was due back.

The phone rang and I jumped, I suppose because I felt guilty for standing in the kitchen eating costly vegetables. I was afraid it was going to be somebody with garden pests, but they'd already turned off the Garden Hotline. It was Hallie calling from a pay phone this side of the border to tell me she'd forgotten to graphite the lock.