On the edge - Jane Jesmond

Jen Shaw has climbed all her life: daring ascents of sheer rock faces, crumbling buildings, cranes the riskier the better. Both her work and personal life revolved around it. Until she went too far and hurt the people she cares about. So she gave it all up and checked into rehab. Then Jen awakens to find herself drugged and dangling off the local lighthouse during a wild storm, and must battle her way to safety. Once safe, Jen has face her troubled past in order to figure out whether something triggered a relapse, or if there is a more sinister explanation.