In the year and a half since Barack Obama left office, dozens of books have been written about his administration, including memoirs by his official photographer, stenographer, speechwriter, communications director, his foreign policy advisers and his director of national intelligence, not to mention the Obamas’ own forthcoming memoirs.

But only one book includes a scene where Obama bursts into a motorcycle gang clubhouse in Delaware, casually toting a sawed-off shotgun, to rescue Joe Biden from a mob of angry, heavily armed bikers.

“Looks like you all know who my pal is,” Biden tells his antagonists with satisfaction.

“He’s the guy who killed Bin Laden,” one of the stunned bikers says.

The unlikely scenario sprung from the twisted mind of Andrew Shaffer, author of “Hope Never Dies,” a new mystery novel starring the 44th president and his vice president as a pair of crime-busting amateur sleuths. It’s the first in a planned crime series, with Obama playing a cerebral, detached, analytical Holmes to Biden’s bumbling, impulsive Watson.