The ruinous sweep / Tim Wynne-Jones.

On the night Donovan Turner is thrown out of a car on a highway in the middle of nowhere, he can barely remember his own name, let alone the past twenty-four hours. Where is he? Where is his girlfriend, Bee? In an attempt to flag down the next passing car, he startles the driver, causing a fatal accident. With sirens in the distance and the lingering feeling that he's running from something--or someone--Donovan grabs the dead driver's briefcase and flees. Meanwhile, Bee is fighting for Dono's life every bit as much as he is. But when the police show up and hint that he is the prime suspect in a murder, Bee is determined to put together the pieces of what happened and clear his name.