CANDYLAND Evan Hunter is known for his powerful novels and screenplays. Ed McBain is known for portraying the soul of the cop. They have distinct narrative voices, but both are bestselling storytellers who have received worldwide acclaim. Now, in "Candyland," they join for the first time to write a single story -- a powerful novel of obsession.  Benjamin Thorpe is married, a father, a successful Los Angeles architect -- and a man obsessed. Alone in New York City on business, he spends the empty hours of the night in a compulsive search for female companionship. His dizzying descent leads to an early morning confrontation in a midtown bordello and a searing self-revelation. Part I of "Candyland" is a fever-pitched search for identity, seen through Benjamin's obsessed eyes and told in classic Evan Hunter style.  Part II opens in Ed McBain territory. Three detectives are discussing a homicide. The victim is a young prostitute whose path crossed Benjamin Thorpe's the night before. Emma Boyle of the Special Victims Unit is assigned to the case. As the foggy events of the previous night come into sharper focus, Thorpe becomes an ever more possible suspect. The detailed police investigation and excruciating suspense are classic Ed McBain.  Shocking, bold, and compulsively readable, "Candyland" is a groundbreaking literary event.