Hourglass Door 1 The Hourglass Door by Lisa Mangum The Hourglass Door by Lisa Mangum (Shadow Mountain, May 2009).
Hourglass Door 2 The Golden Spiral by Lisa Mangum The Golden Spiral by Lisa Mangum (Shadow Mountain, May 2010).
Hourglass Door 3 The Forgotten Locket by Lisa Mangum The Forgotten Locket by Lisa Mangum (Shadow Mountain, June 2011).