Showing From the Cradle (The Submissive Heart) by Michelle Knight

The third book in The Suibmissive Heart series.

L's closest friend, Kate, had gone through the nervewracking process of understanding the power exchange relationship that she enjoyed with her Dominant, Mark.

As it turned out, L would need Kate's close friendship as there were serious skeletons in Mark's closet that were about to make themselves known.

All this, of course, was about to surface at a time when L's life was about to change in dramatic style, taking everyone else along for the ride.