The missing hours / Emma Kavanagh.

Enhanced descriptions from Syndetics:

"Murderers are rarely who you imagine them to be . . . "

One moment, Selena Cole is at the playground with her children . . . the next, she has vanished without a trace.

The body of Dominic Newell, a well-respected lawyer, is found on a remote mountain road, blood oozing from the stab wound in his neck.

In the sleepy borderland between England and Wales, sheep outnumber people and serious crimes are rare. Which makes this Tuesday morning, with two calls coming in to the local police station, even more remarkable. Detective Constable Leah Mackay and her brother, Detective Sergeant Finn Hale, begin their respective investigations, but soon find them inextricably linked. And when Selena is found alive and unhurt twenty hours later, the mystery deepens.

Selena's work consulting on kidnap and ransom cases has brought her into close contact with ruthless criminals and international drug lords. But now, as Selena walks back into her life wearing a blood-spattered sweater, claiming no memory of the preceding hours, Leah can't be sure if she is a victim, a liar, or a murder suspect.

Leah and Finn delve into each case, untangling the secrets and betrayals--large and small--that can lie just beneath the surface of a life, yet unprepared for where both trails will lead.

With engrossing characters, devilish twists, and evocative prose, The Missing Hours is that rare page-turner--as satisfying and complex as it is unpredictable.