At first Helen had been confused.

Lock?

Not love, okay love wouldn't be something so obvious for Nikola.

But lock?

Not lips, or lingerie, or even lick?

Then Helen read the whole note.

"Oh," Helen giggled remembering trying to mentally make Nikola figure it out back then. Some nights she was so bored and wished he'd just sneak in to poke at her, even if it was just to update her on how his sick pigeon was doing.

Wait, if Nikola hadn't realized until much later, then;

"James Watson!" Helen giggled again. One of Helen's prized possessions, a first edition of a medical text from her father had vanished for exactly one month then returned with stains on it. James had said Nikola must have needed it for something when he must have snagged it.

"L is for liar," Helen giggled as this note she set with the others as she went to get dressed. Her smile making it very clear she was so not even remotely mad or even bugged.

Helen sighed as she dug in her closet and noticed one of her suit coats on the floor, "L is for Lazy, Nikola, really, you could have hung it back up."