hostage_travel_invalidation_effect

hostage_travel_invalidation_effect = {
	if = {
		limit = {
			exists = var:hostage_travelling_to_warden
			OR = {
				var:hostage_travelling_to_warden = {	
					OR = {
						# Warden dies (flag:warden)
						is_alive = no
						# Warden loses lands (flag:warden)
						is_playable_character = no
						# War
						AND = {
							exists = root.liege
							is_at_war_with = root.liege
						}
					}
				}
				# Hostage is jailed (flag:imprisoner)
				is_imprisoned = yes
				# Hostage becomes landed (flag:ruler)
				is_playable_character = yes
				# No longer important to home court (flag:invalid)
				trigger_if = {
					limit = { exists = liege }
					NOR = {
						is_child_of = liege
						is_grandchild_of = liege
						is_sibling_of = liege
						is_nibling_of = liege
					}
				}
				trigger_else = {
					# Home court no longer landed (flag:home_court)
					NOT = { exists = liege }
				}
			}
		}
		save_scope_as = hostage
		if = {
			limit = { exists = liege }
			liege = { save_scope_as = home_court }
		}
		var:hostage_travelling_to_warden = {
			send_interface_toast = {
				title = hostage_invalidated_during_travel_title
				left_icon = scope:hostage
				right_icon = scope:home_court
                show_as_tooltip = {
                    scope:hostage = { return_hostage = yes }
                }
			}
		}
		scope:home_court ?= {
			send_interface_toast = {
				title = hostage_invalidated_during_travel_title
				left_icon = scope:hostage
				right_icon = scope:hostage.var:hostage_travelling_to_warden
				scope:hostage = {
					show_as_tooltip = { return_hostage = yes }
					current_travel_plan = {
						if = {
							limit = { can_cancel = yes }
							cancel_travel_plan = yes
						}
					}
					set_location_to_default = yes
				}
			}
		}
		if = {
			limit = { is_alive = yes }
			remove_variable = hostage_travelling_to_warden
		}
		debug_log = "Hostage invalidated during travel"
		debug_log_scopes = yes
	}
}

As written in game/common/scripted_effects/05_bp2_hostage_effects.txt.