As an aside, it is worth noting that "Character Development" in Call of Cthulhu is very weak. Skills only increase marginally over time and Sanity is guaranteed to diminish. I usually warn my players that, unlike most other RPGs, Characters in CoC do not improve and, in fact, they will significantly decline over time. As they lose more and more Sanity, they will literally go mad, and many Mythos monsters have damaging effects that are permanent.