Jane Rizzoli and Maura Isles are best of friends and cousins. They don't believe in seeing someone more than once. The rule is never sleep with someone more than once.
They end up breaking their own rule.
Maura Isles and Jane Rizzoli have been friends for years as well as cousins. They have 95 percent of the time supported one another even of they didn't always agree. Christmas day arrived. Everyone had just returned from vacations a week ago from various places.