Information on the type of support governments can provide to their nationals in the wake of a kidnap incident can usually be found on the foreign affairs department website. For instance:
The UK’s Foreign and Commonwealth Office has published Support for British National’s Abroad: A Guide
Global Affairs Canada’s guidance can be found on their Consular Service Charter
Policies on hostage-taking and resolution vary from government to government, and the information can be found in policy and position papers or statements made by elected officials. It is essential to know a government’s policy in order to understand the parameters within which any resolution can take place. For instance, in many countries, it is illegal for anyone (individual or organisation) to pay a ransom to a proscribed terrorist organisation.