The Microsoft Lifechat headset.
Montclair Radiology patient portal.
The crime: there are three IAs who control the city. Each has it's own weaponry.
The White Queen controls the SUZI security android force.
The Medusa has an army of killbots -- floating little poison-infected things that can key onto an individual's biology.
Amaryllis controls nanobiotechnology. That's used for both medical and security purposes.
Robots have certain other powers. They can see into the future. Some see better than others. The ones who see all the paths are called Cassandras. The Cassandras were all but wiped out in the wars between the Warlord AI's, before the truce and peace of The Triad. Their manufacturing plants were shut down and all the humans involved with creating them were exiled or terminated.
Amaryllis, a powerful AI who is worshipped as a god, has died. But the only people who know this are The Medusa and The White Queen. This could permanently upset the balance of power in the city.
The Cassandra is dead. The Cassandra was supposedly killed by the White Queen because the Cassandra knew of the Trojan Horse the White Queen had planted in Amaryllis and had warned Amaryllis (who ignored her.)
Except both the White Queen and the Medusa know a Cassandra is very hard to kill.
The Medusa believes that a hunt for the Cassandra's killer, will reveal the Cassandra herself -- putting her into grave danger before she can advise the Medusa on how to prevent it's OWN death. The White Queen believes that putting Logan on the hunt for the Cassandra will give the White Queen another opportunity to murder the Cassandra, leaving her free to take over the city with the Amaryllis nanobots.
When Logan finds the real Cassandra, the two of them race across town to the Amaryllis Castle, only to discover the god has perished.