All concepts 
Character · Relation

Secret Keeper

An intimate confidant dynamic and defensive relational framework where one entity possesses exclusive, classified knowledge of another's hidden past or systemic flaws, bearing the heavy ethical weight of trust and information control.

The thrill of shared secrets and the dangerous intimacy of knowing someone's hidden truth. The weight of trust and the power of information control, creating a tense, protective bond.

Books

DivergentVeronica Roth
Use of WeaponsIain M. Banks
InversionsIain M. Banks
CryoburnLois McMaster Bujold
Four Dead QueensAstrid Scholte
The Tainted CupRobert Jackson Bennett
The Glass MagicianCharlie N. Holmberg
StilettoDaniel O'Malley
The Forbidden TowerMarion Zimmer Bradley
Heroine complexSarah Kuhn
EliteMercedes Lackey
DefianceC. J. Redwine
SepulchreJames Herbert
RimrunnersC. J. Cherryh
Blood OathChristopher Farnsworth
Fire SeasonDavid Weber
Sing Me to SleepGabi Burton
Last GuardNalini Singh
Dead SpaceKali Wallace
These Burning StarsBethany Jacobs
SeraphinaRachel Hartman
After the DarkMax Allan Collins
SupernovaKass Morgan
The murderer's apeJakob Wegelius
The Memory of BabelChristelle Dabos
The President's VampireChristopher Farnsworth
The golden cityJ. Kathleen Cheney
VenomJennifer Estep
Mind GamesKiersten White
BoneyardsKristine Kathryn Rusch
VeiledBenedict Jacka
Royal GambitDaniel O'Malley
Disappearing actMargaret Ball
Steel Crow SagaPaul Krueger
Very Hard ChoicesSpider Robinson
The paradoxCharlie Fletcher
BoogeymenMel Gilden
BrillianceMarcus Sakey
Games of commandLinnea Sinclair
Getaway WorldE. E. "Doc" Smith

Related

IntermediaryProtector / WardSymbioticMaster / ServantGuardianEspionageSleeper-AgentDeniable Asset