“Treading Water” is a romantic suspense series by Marie Force, known for its richly detailed settings and complex, flawed heroines. The stories often unfold in the affluent world of yachting and private security, blending high-stakes action with deeply emotional relationships and a consistently dark, atmospheric tone. It distinguishes itself with Force’s signature blend of grit and glamour, exploring the morally ambiguous lives of those operating on the fringes of wealth and power.