What metaphors are used in Dead Sleep by Greg Iles?

Example of Metaphor:

"For eighteen months Jane has lived in suspended animation, imprisoned by a man who saved her life, a desolate bird in a gilded cage. All that time, I trudged alone through a dark tunnel, burdened by guilt, haunted by loss, feeling hope die. A metaphor for my life, really: a lone woman lost in a tunnel with a camera, bearing witness to what happens in the dark, even as the darkness seeps into her. But today... Today I emerge into the light."