Alice = black mailer and untrustworthy
Bob = victim and trustworthy
Police should reward BOB and punish Alice.
Alice is on the bus and suddenly BOB
You forgot the Busdriver !!!!!!
The Cops never will know this Case because the Busdriver manage it self with both of them !
The Happy End : Alice gets his phone back , Bob walk for the rest of his Life and got banned to driving on the Bus , and the Cops are just a Name in this Story !

LOL