Seeking Asylum by Mallory Kane. This is a Harlequin Intrigue series novel.
As one of the Bureau's top criminal profilers, it was Eric Baldwyn's job to get inside killers' heads. Only, this time, the crazed shooter who'd taken a beautiful doctor hostage was Eric's brother - the identical twin he'd long thought dead.
Being abducted by her own patient was terrifying enough. Now the man who'd just rescued her needed Dr. Rachel Harper's help. Assuming his brother's identity to infiltrate a conspiracy inside a mental hospital, Eric Baldwyn was about to embark on the most dangerous mission of his life. And as danger fanned the flames of irresistible desire, much more than Rachel's career would be on the line.
The book is in Fair but completely readable condition with slight page yellowing due to age, common in paperback books. Free shipping and only $3.99. This is a great find for any Romance or Harlequin fans.