Unwanted Guests & A Gruesome Discovery!!

Sounds like a horror story...well it is of sorts.
For some time now, I have had unwanted guests...
Little crawling beetles that are so tiny my camera wouldn't photograph them.
They appeared in the living room, all over the bay window & the window seat...
I had no idea how they got there, presumed they were from the window itself.....
Now me being a computer geek, has recently thrown teddy out of the pram because my two front USB ports on my tower do not like my cordless mouse. Today, I purchased a rather tiny 4 port hub...(kind of an extension cable for USB's, for those not computer technical)
However, I needed an adapter from one of my corded mice to plug it into the back of the tower.
Knowing I would find this upstairs in the attic room (I have a proper staircase, complete with wooden banister railing rising 10ft into the ceiling in the living room of my flat which goes up to a carpeted room which is meant to be the third bedroom although it is far too hot in summer & Siberia in the winter!)
I knew when I walked in there something eerie was afoot.... the damn beetles were everywhere. The hairs on the back of my neck stood up & my scalp began to itch....
Then in the corner on the shelving I spotted a toy frog I had made from a craft kit of felt & beans to fill it. It was sat in a pile of yellow looking sawdust & when I went over to inspect it, the frog was stiff as though filled with concrete. It had holes all over it like it had been shot & these beetles were all over it. Thousands were dead & some nearly dead....
Ugh!!! Either something got in & laid its eggs in the frog, or whatever they are were in the beans that came as the filling...
Tomorrow, when I have plucked up the courage to go back up there, I will go armed with my trusted Dyson & suck them all up. Then destroy the frog......
And after all that, yup you guessed it, I never found the adapter in there at all!!!!!!!!