Plagued by memories of her previous life, your wife Natasha, let them out unknowingly while she slept -- some people sleeptalk, sleepwalk, sleepeat -- Natasha sleepundresses and sleep-selfbinds too.
That fateful night, when you were away for work on the oil rig, she had an intense episode, undressed herself with gusto (sadly without anyone to witness and appreciate), grabbed her rope, keys (and cellphone (she's responsible like that; besides let's all admit we're addicted to our phones), headed to the elevator of the ritzy building you live in (most of the tenants are lecherous old men - again, so sad they didn't get to take their toy out to play), and took it to the penthouse floor.
P.s. I followed the rules - that's 2 sentences