The Escape Room by Megan Goldin

High finance has never been more dangerous. Four colleagues are summoned to a building under construction for what they think is a corporate team building exercise that becomes a deadly game of escape the elevator. The intensity builds quickly as they become mad then frantic to solve the clues. The other part of the book also deals with the early days of the team and those who are no longer part of this corporation's rat nest. Each one has secrets, each has been pushed to their limits but they must work as a team to survive. Thriller junkies will love this but you may want to take the stairs for a while.