Gravity is the 12th stand-alone novel by Tess Gerritsen. When Dr Emma Watson ends up on the crew of the Russian-American space station, its a dream come true for her. But nothing runs smoothly: the payload experiments are going wrong, crew are getting sick and dying and half the module is on low power due to problems with the solar array. Gerritsen is the master of the medical thriller, and this time, the scene is out of this world. Once again, she gives us an excellent plot with a few great twists; politics and intrigue, in a unique environment and under extraordinary conditions. A Gerritsen winner