IRDIE WAS CHASING A VERY LARGE DOG ALONG A VERY WHITE beach. The dog wore an elaborate apparatus with lines rising to a bright red parachute high in the sky.

Katy dangled upside down from the chute, long blond hair waving in the wind. Sunlight glinted from tears on her cheeks.

A gull screeched.

The dog stopped.

Katy’s chute deflated and she drifted earthward.

Fast. Too fast.

The gull’s screeching morphed to a very loud buzzing.

I raised one semiconscious lid.

The room was dark. The bedside table was vibrating.

I fumbled for my BlackBerry and clicked on.

Don Ho was singing “Aloha Oe.”

“How is my sweet rose of Maunawili?” A male voice. Not Don’s.

Another twist to the dream?

No. My eyes were open. One managed to drag the clock face into focus.

“Do you know what time it is here?” Seemingly a frequent opener on calls to Hawaii.

“Seven.”

“Redo the math, Ryan.”

“Give me a hint.”

“There’s a five in the answer.” Technically, two. The little green digits said 5:59.

“Oops. Sorry.”

“Mm.”

“That means I woke you.”

“I had to get up anyway to answer the phone.”

“That line is ancient.”

“It’s way too early for anything original.”

“Thought you’d want to know. Floating Florence gave up some DNA.”

“Floating Florence?”

“Nightingale? As in nurse? The Hemmingford corpse? Your lab pals did STR. Whatever that is.”

“Short. Tandem. Repeat.”

“Sorry. Too. Rarefied.”

“Come on, Ryan. STR has been around since the nineties.”

“So has cloning. Still no one gets it.”

“It’s standard for most forensic DNA labs.”

Ryan was smart, genius at some things. Science was not one of them. Silence meant I was sailing right over his head.

Great. Biology 101 at dawn.

“Each DNA molecule is made up of two long chains of nucleotide units that unite down the middle like rungs on a ladder. Each nucleotide unit is composed of a sugar, a phosphate, and one of four bases, adenine, cytosine, guanine, or thymine. A, C, G, or T. It’s the sequencing of the bases that’s important. For example, one person can be CCTA at a certain position, while another is CGTA. With STR, four or five sequence repeats are analyzed.”

“Why?”

“Shorter repeat sequences can suffer from problems during amplification. Also, some genetic disorders are associated with trinucleotide repeats. Huntington’s disease, for example. Longer repeat sequences are more vulnerable to degradation. And they don’t amplify by PCR as well as shorter sequences.”

“Ten words or less, how does STR work?”

“Ten?”

“I’ll go twenty, that’s my top.”

“First, you extract nuclear DNA from your sample. Next, you amplify specific polymorphic regions—”

“Flag on the field. Jargon violation.”

“Regions on the genome where there is variability. You amplify, you know, make more copies. Then you determine how many repeats exist for the STR sequence in question.”

I was oversimplifying for Ryan’s benefit. It seemed to be working.

“Once you’ve got the genetic fingerprint from your suspect or unknown, in this case the Hemmingford floater, you compare it to that of a family member, right?” he asked.

“Even better, you compare a sample from your suspect or unknown to another sample taken from him or her before death. Extracted or saved baby teeth. Saliva from a toothbrush. Mucus on a tissue.”

“So our next step is to swab Plato’s cheek or find Spider’s own snot.”

“Nice.”

“You said it.”

“With much more élan.”

“But similar connotation. Think Daddy will agree to open wide and say ahh?”

“I don’t know,” I said. “It’s doubtful he’s going to like the results.”

“Very,” Ryan agreed.

For several seconds empty air hummed across the line. Then Ryan asked about Katy.

“She’s still pretty bummed,” I said.

“You never mentioned a boyfriend. Did you know she was head over heels for the guy?”

“No.”

Absence? Inattentiveness? Whatever the reason, my ignorance spoke of remoteness.

“She’ll come around.”

“Yes. How’s Lily?”

“Attending group and keeping appointments with her psychologist. Her color’s better and I think she’s gained a little weight.”

“Don’t tell her that.” An attempt at levity. It fell flat.

“The kid’s saying all the right things. But I don’t know.” Ryan drew a deep breath, exhaled. “Sometimes I get the feeling she’s just going through the motions. Telling me what she thinks I want to hear.”

Not good. Ryan’s instincts were usually dead-on.

“And she and her mother are like fire and ice. Lutetia’s trying, but patience is not one of her strengths. Lutetia says something, Lily overreacts, Lutetia comes down hard, they both explode, and I end up dealing with the aftermath.”

“Sounds like they need a break from each other.”

“You’ve got that right. But I can’t have Lily living with me. At this stage of rehab she needs someone around all the time. I’m away most days, often at night. You know.”

I did.

Ping!

Bad plan.

It’s perfect.

“Fly out here.” Spoken before follow-up from the wiser brain cells.

“What?”

“Bring Lily to Hawaii. Katy’s alone all day. They’re close enough in age to be company for each other.”

Twenty-four. Nineteen. From my perspective it looked like a match.

“You’re nuts.”

“You three can play tourist while I work. Then we’ll party at night.”

“I can’t.”

“You’ve banked, what, ninety years of unused vacation time? All it will cost you is a couple of tickets. There’s plenty of room here.”

I pressed on, though already I was questioning the wisdom of the whole idea.

“A change of climate could help. Lily was born in the Abacos. Maybe Hawaii will remind her of home.”

“Lily’s court agreement prohibits her leaving the province.”

“Puh-leeze. She’d be with you, a sworn officer. Surely you know a judge who would bless that.”

There was a very long pause.

“I’ll call you back.”

Danny wasn’t there when I arrived at the CIL. But Dimitriadus was. With a frosty nod, he disappeared into his office.

Aloha to you, too, sunshine.

Donning a lab coat, I picked up where I’d left off with 2010-37. Under the tap, a fragment grudgingly yielded a suture, a squiggly line where the occipital bone had once met the left parietal bone at the back of the skull.

Oh?

I scraped gently with my toothbrush. Detail emerged.

Son of a gun.

Remembering the maxilla, I returned to the table.

Son of a gun.

I was back at the sink when Danny’s laugh rang out, an unbridled soprano, infectious as typhoid.

Minutes later, Danny strode toward me. At his side was a giraffe of a man, tall and sinewy, with elephantine ears.

“Good to see you, Tempe.” Craig Brooks, a CIL dentist, shot out a hand.

“Good to see you,” I said as we shook.

“Danny claims you’ve discovered the lost Dutchman mine.”

“Hardly.” Another girly giggle. “Tempe’s find is the size of a mite.”

“Let’s check it out.”

Craig spent a long time at the scope, positioning and repositioning our mushroom-duck thing, adjusting and readjusting the two snake lights. Finally he sat back.

“Danny boy’s right. The material is gold.”

“Part of a filling or cap?” I asked.

“Nope.”

“You’re sure?”

“I’ve seen a lot of melted dental work, and this doesn’t fit the pattern. There’s some distortion due to heat exposure, but that’s localized along the rounded edge. The rest of the shape looks original. And it doesn’t track right for either a restoration or crown.”

“How so?”

“First, it’s far too thin. Second, one surface is smooth but has some rounded relief. The other surface is roughened but flat.”

“So what is it?” I asked.

Craig raised and lowered his shoulders. “Beats me.” He rose. “But I’ll think about it.”

When Craig had gone I told Danny I had something to show him. He asked if it could wait ten minutes. He needed to place a call before nine.

I was walking toward the sink when my mobile sounded. I checked the LCD screen, expecting Ryan’s number. The line was local, but not the Lanikai beach house.

Curious, I clicked on.