Sneakoscope question

[ladyramkin2000]

No: HPFGUIDX 95620

Soorry I omitted to quote Electrogirl's original question re. the 
Sneakoscope, i.e. why did it suddenly go off in the railway carriage 
where Lupin was sleeping (?) and who was untrustworthy.  Mea culpa. 
My excuse is that I was trying to type and ward off the attentions of 
a two-year-old at the same time.

Sylvia (only another week left of the school holidays)