The City Lawyer by John Grisham

Michael Brock thought he had everything required for a perfect life - an upward career in a law firm with a five figure salary, a wife with a fast track medical career, a luxurious apartment in the 'right' part of the city and his and hers sports cars until one fateful morning. Michael and eight work colleagues are held hostage by a homeless man who is eventually shot dead by police marksman. Unravelling the reasons why he was taken hostage leads Michael to re-evaluate his life in his quest to achieve justice for the dead man.