The Simple Rules of Love is a multi-generational story of love, lies and family ties. The Harrisons, a close-knit, affluent clan who gather regularly at Ashley House, their beautiful old family home, are looking forward to 42-year-old Cassie’s long awaited wedding and an exotic family holiday. But all such celebrations threaten to subside into chaos when an unwanted pregnancy, adultery and shadows of past losses stretch sibling and marital bonds to breaking point.