Hints of a larger ring

Sarah’s investigation at the warehouse hinted at the involvement of a larger crime ring. ‘These symbols aren’t random,’ she said, circling one in particular.
Her partner, Dan, nodded. ‘Looks like some sort of code. We need an expert to confirm it.’ They bagged various items for evidence.
‘Could be our key to cracking this case wide open,’ Sarah noted. The clues pointed to a network, not just a lone operator.