Mondays Are Murder — Tanya Landman

First in a series of brilliantly addictive, tightly plotted murder mysteries featuring the irrepressible Poppy Fields.When Poppy Fields goes on an activity holiday to a remote Scottish island, she is looking forward to a week of climbing, hill-walking and horse riding. But things take a disastrous turn when their instructor has what appears to be a fatal abseiling accident. When Poppy discovers that his rope was cut, and more of the instructors start to have "accidents", she and best friend Graham suspect foul play and decide to investigate.