"WHAT ARE YOU DOING?"

Evelyn's voice cut through the hallway.

Michael turned.

His new wife stood near the stairs, holding a grocery bag.

"Evelyn, who's in the basement?"

Her face went pale.

Then she smiled.

"Michael, sweetheart, nobody's down there."

Harper hid behind her father's leg.

"She's lying, Daddy!"

Evelyn crouched down.

"Harper, honey, remember what we talked about? Sometimes when we miss someone very much, we imagine hearing them."

Harper shook her head.

"No! Mommy sang to me!"

Michael looked at Evelyn.

"Sang?"

Evelyn nodded quickly.

"She's been having dreams again. You know how much she misses Rachel."

But Michael couldn't forget the voice.

It had sounded exactly like his first wife.

He reached for the basement doorknob.

Locked.

"Where's the key?"

Evelyn's smile disappeared.

"Michael, we need to talk privately."

Harper began crying harder.

"Daddy, please don't go!"

He knelt beside her.

"I'm not going anywhere, sweetheart."

Then three soft knocks came from beneath the floor.

Harper looked up.

"Mommy's knocking!"

Chapter cliffhanger: Michael remembered that Rachel used to knock three times on Harper's bedroom door before singing her to sleep.