The following is a list of hostages taken by the Vespers in Cahills vs. Vespers.
The Medusa Plot[]
- Fiske Cahill: Captured while bathing in a hot tub in California. The Vespers captured him by releasing a baby water moccasin snake into the tub. He is a Madrigal.
- Status: Injured, shot in the shoulder, recovered, escaped
- Reagan Holt: Captured while swimming in Puerto Rico when she was chased by a shark. She enters a shark cage, but the people on the boat were Vespers. She is a Tomas.
- Status: Injured, broken wrist, chest injury (trouble breathing), escaped
- Natalie Kabra: Captured while shopping in London, England when she was captured by the Vespers by going into a soundproof box. She had thought it was a changing room. She was a Lucian. She was killed by trying to destroy the Machina Fini Mundi.
- Status: Escaped, Deceased
- Nellie Gomez: Captured while eating a powdered jelly croissant in France that caused her to faint. She is not a Cahill by blood but has Madrigal status.
- Status: Injured, shot in the shoulder, bullet removed, bit by dogs. Recovered, escaped.
- Alistair Oh: Captured in an elevator in Tel Aviv, Israel while going to the optometrist. Endured a savage kick from a Vesper and fell on the same knee while trying to save Phoenix from falling into a river. He was an Ekaterina.
- Status: Infected knee, Deceased
- Ted Starling: Captured in an elevator in Tel Aviv, Israel while trying to find a cure for his blindness. He is an Ekaterina.
- Status: Injured, also blind, but not from Vesper activity, escaped
- Phoenix Wizard: Captured at a Jonah Wizard concert in Tokyo, Japan while trying to find the 'hip-hop vibe.' He is a Janus.
- Status: Injured, gash on head, escaped
A King's Ransom[]
- Atticus Rosenbloom: Captured while running to Amy and Dan. He is a Guardian.
- Status: Escaped
Day of Doom[]
- Jonah Wizard
- Hamilton Holt
- Evan Tolliver (deceased)
- Ian Kabra